Can only guess its because he didn't set his stream to game as poker. Still seems pretty bad to actually close the channel without warnings due to something like that..
I dont know the details of the twitch rules, but that would suck a lot... even if he create a new channel, that would still result in the loss of all followers
If you highlight your videos I read that it limits them to 2 hours? So say if you have like a 6 hour stream could you highlight it and do like 3 x 2hr segments?