User blog comment:Leolab/Policy Changes/@comment-4693949-20120526192406/@comment-422690-20120528014017

Not sure which sectio you're asking about, but here are the relevant sections from the rematch and rewrite sections:

Rematch: "In the case of inactive or retired authors, the three supporters rule still applies, and an admin approval is needed as well."

Rewrite: " If the original author is inactive, the user must get the permission from at least two other administrators as well as the support of three other users to rewrite it."

Banned users are considered inactive.