Hi!
First, sorry for any trouble caused by this redaction and thanks for bringing this issue to my attention.
The redaction algorithm tries its best to keep valid objects intact, but, as you all saw, some nodes (which were touched by the redacted data) were left disconnected from their ways (thus affecting the buildings geometries).
The buildings were restored as best as possible but if you still see any problem with them (or other kind of problem caused by the redaction), please, contact me (via email, message in OSM, ping on IRC or even through data@osmfoundation.org)
Thanks for understanding and for the patience, and again, sorry for any inconvenience.
Best regards, Nelson