I just heard from customer service. I was told that they didn't see anything that warranted this action, but that they leave it up to the discretion of the commish. I asked them to take another look at the situation and let me back in.
I'll never join one of his leagues again, but I kinda want back in so I can have a chance at taking him down. At the time of the conflict, he was in first, and I was hot on his tails in 2nd. I'm sure he's happy to not have to deal with that....
I'm hoping that CS will do the right thing here.