Last modified: 2013-06-18 13:34:36 UTC
In CentralAuth, hiding but not locking an account still permits that account to edit. The account disappears from Special:GlobalUsers but it's still able to log in, make edits and the like (see URL). This seems as a problem, I don't really understand why anyone would hide an account's name but still allow it to appear in Recent Changes.
I believe if you want the account to not edit, lock it separately. locking and hiding are different.