The main problem is that the mapper in question has a lot of legit edits mixed up with those that are problematic. I mechanically produced a list of 133 changesets that are potentially problematic, but it would be nice if they could be reviewed
https://openstreetmap.org/changeset112528548 https://openstreetmap.org/changeset112528532 https://openstreetmap.org/changeset112528233 https://openstreetmap.org/changeset112528091 https://openstreetmap.org/changeset112528003 https://openstreetmap.org/changeset112518872 https://openstreetmap.org/changeset112517215 https://openstreetmap.org/changeset112492966 https://openstreetmap.org/changeset112491695 https://openstreetmap.org/changeset112490920 https://openstreetmap.org/changeset112490109 https://openstreetmap.org/changeset112489691 https://openstreetmap.org/changeset112475704 https://openstreetmap.org/changeset112471802 https://openstreetmap.org/changeset112466081 https://openstreetmap.org/changeset112465624 https://openstreetmap.org/changeset112464525 https://openstreetmap.org/changeset112464225 https://openstreetmap.org/changeset112463222 https://openstreetmap.org/changeset112462785 https://openstreetmap.org/changeset112462391 https://openstreetmap.org/changeset112453869 https://openstreetmap.org/changeset112452881 https://openstreetmap.org/changeset112451984 https://openstreetmap.org/changeset112450687 https://openstreetmap.org/changeset112449030 https://openstreetmap.org/changeset112448145 https://openstreetmap.org/changeset112447522 https://openstreetmap.org/changeset112445847 https://openstreetmap.org/changeset112445337 https://openstreetmap.org/changeset112444568 https://openstreetmap.org/changeset112444133 https://openstreetmap.org/changeset112431013 https://openstreetmap.org/changeset112428845 https://openstreetmap.org/changeset112428221 https://openstreetmap.org/changeset112427951 https://openstreetmap.org/changeset112427591 https://openstreetmap.org/changeset112427067 https://openstreetmap.org/changeset112426836 https://openstreetmap.org/changeset112426407 https://openstreetmap.org/changeset112426031 https://openstreetmap.org/changeset112425526 https://openstreetmap.org/changeset112424161 https://openstreetmap.org/changeset112423865 https://openstreetmap.org/changeset112423488 https://openstreetmap.org/changeset112423331 https://openstreetmap.org/changeset112422899 https://openstreetmap.org/changeset112422611 https://openstreetmap.org/changeset112422316 https://openstreetmap.org/changeset112421155 https://openstreetmap.org/changeset112420765 https://openstreetmap.org/changeset112420352 https://openstreetmap.org/changeset112419645 https://openstreetmap.org/changeset112418097 https://openstreetmap.org/changeset112416941 https://openstreetmap.org/changeset112416713 https://openstreetmap.org/changeset112415298 https://openstreetmap.org/changeset112414682 https://openstreetmap.org/changeset112409937 https://openstreetmap.org/changeset112409700 https://openstreetmap.org/changeset112408687 https://openstreetmap.org/changeset112408229 https://openstreetmap.org/changeset112407296 https://openstreetmap.org/changeset112405618 https://openstreetmap.org/changeset112404900 https://openstreetmap.org/changeset112404438 https://openstreetmap.org/changeset112404255 https://openstreetmap.org/changeset112403134 https://openstreetmap.org/changeset112402709 https://openstreetmap.org/changeset112402131 https://openstreetmap.org/changeset112401412 https://openstreetmap.org/changeset112401094 https://openstreetmap.org/changeset112400626 https://openstreetmap.org/changeset112400441 https://openstreetmap.org/changeset112398988 https://openstreetmap.org/changeset112387834 https://openstreetmap.org/changeset112387550 https://openstreetmap.org/changeset112387337 https://openstreetmap.org/changeset112387207 https://openstreetmap.org/changeset112384840 https://openstreetmap.org/changeset112384423 https://openstreetmap.org/changeset112383846 https://openstreetmap.org/changeset112382280 https://openstreetmap.org/changeset112381805 https://openstreetmap.org/changeset112381418 https://openstreetmap.org/changeset112380982 https://openstreetmap.org/changeset112380165 https://openstreetmap.org/changeset112379699 https://openstreetmap.org/changeset112379080 https://openstreetmap.org/changeset112378549 https://openstreetmap.org/changeset112377777 https://openstreetmap.org/changeset112377724 https://openstreetmap.org/changeset112377544 https://openstreetmap.org/changeset112377271 https://openstreetmap.org/changeset112376632 https://openstreetmap.org/changeset112376400 https://openstreetmap.org/changeset112376093 https://openstreetmap.org/changeset112375893 https://openstreetmap.org/changeset112375685 https://openstreetmap.org/changeset112363157 https://openstreetmap.org/changeset112265519 https://openstreetmap.org/changeset112265000 https://openstreetmap.org/changeset112263969 https://openstreetmap.org/changeset112263913 https://openstreetmap.org/changeset112263555 https://openstreetmap.org/changeset112262983 https://openstreetmap.org/changeset112248004 https://openstreetmap.org/changeset112246931 https://openstreetmap.org/changeset112214180 https://openstreetmap.org/changeset112206533 https://openstreetmap.org/changeset112205418 https://openstreetmap.org/changeset112202751 https://openstreetmap.org/changeset112201203 https://openstreetmap.org/changeset112199497 https://openstreetmap.org/changeset112186192 https://openstreetmap.org/changeset112184131 https://openstreetmap.org/changeset112171133 https://openstreetmap.org/changeset112168538 https://openstreetmap.org/changeset112159530 https://openstreetmap.org/changeset112155506 https://openstreetmap.org/changeset112139123 https://openstreetmap.org/changeset112138620 https://openstreetmap.org/changeset112137961 https://openstreetmap.org/changeset112136898 https://openstreetmap.org/changeset112134822 https://openstreetmap.org/changeset112092199 https://openstreetmap.org/changeset112092174 https://openstreetmap.org/changeset112091410 https://openstreetmap.org/changeset112091073 https://openstreetmap.org/changeset112091023 https://openstreetmap.org/changeset112090993 https://openstreetmap.org/changeset112090937 https://openstreetmap.org/changeset112044734