I can't find any recently deleted threads about Jordan Peterson.
I tried searching in case it had been moved, but WrongPlanet's search function is of little use for that sort of thing. It may have been merged with another thread, particularly if it is about him getting coronavirus. If it isn't topical then it may have been moved to one of the discussion forums.
I'd hope that we wouldn't delete a thread just because the OP doesn't like it. Outside of the Haven and Members Only, threads are not "owned" by their creators.