ChinaNumberOne was the same as SupportTransPeople later on. I cannot confirm if it is soferman or one of the banned persons, but it seems to be either the bored /pol/ trolls or someone actively holding a grudge.

I can usually identify these people with not much difficulty, and try to come up with ways on how platforms can become more resilient against this stuff. Against active moderation, trolls are powerless, so it will be fine. Signup form and slur filter seem to be working well, as those people automatically filter themselves out.