No he didn't pay back.
Yes he may still be active in this community, so be careful.
Whoa, I'll be careful then!
So from this small and unscientific sample, there seems to be strong consensus that he just took the money and ran. I guess that's probably the case because if he was interested in rebuilding his reputation (and had legitimately been hacked) then he would probably still be posting on here and slowly paying people back.
Anywhoo, luckily I only used inputs to withdrawl from coinchat and never kept the money in there so I was lucky on this one.