This is not the real name of a real user, but an identity dispute.
This user will stay here to remind us of this kind of phenomenon that should be avoided in the planned Wikis. For instance the evolution of a sysop power structure that practices sysop vandalism and sysop vigilantiism. These figure in some of our most dangerous worst cases, so we should be aware of these issues.
As you may notice from the Special:Listusers this user does not even have the "Sysop"-flag set.