but can this ban on yz33d be temporary?

Well, since I'm just an acting admin because PaulH doesn't read the BBS very often, the actual final say in this matter is all Paul's.

My opinion is that even if he begs for mercy and promises never to do that sort of thing again, he's already got two strikes against him going into it. And as I've said already, he's been vocal about his world-view and his attitude, which doesn't bode well for the idea of someone who can be reformed.