Within a minute, we got an abuse report from TGS telling us it is niman.
It was.
It sure looks to me like TGS was being stalked by this guy.
This post here explains much, I believe. Including how just on the guy's screen name TGS knew it was Niman.
If TGS could give a good explanation as to why he had these multiple screen names laying around from 2001, and why he was trying to play niman's game of making himself look like multiple people (which he knew had gotten niman banned many times), then I would recommend he be restored.