I would argue that even self-mod threads that Ratimov cleaned out should be restored and locked, if that's not done already.
The self-moderated topics were not restored. At least the risk was known when I posted in there (I just didn't expect it).
To me it seems that a self-mod OP going on a rampage and emptying multiple threads for no reason should be dealt with in a similar way as a moderator on a rampage would be dealt with. I think in the latter case deleted content would be restored. And the person would likely be stripped of the delete-other-users-posts privilege.