It's not just a mod that has a problem with him, a lot of people have had conflicts with him. But, unfortunately, i guess being a thread derailing, self-important asshole isn't reason enough to permanently ban him. I'd say silencing him is a good enough punishment.. for now.
EDIT: Damn double posts.
Anyway, as for why now of all times, i'd say it's because his 'attacks' are becoming more and more scathing. Heck, he's not even trying to cover his argument seeking comments with some phony logic anymore.