The thing is phil hellmuth has a brand built where is is known as the poker brat. He's a smart guy and he surely has p.r. people, and they all realise that by these few blow ups he's living up to him name and increasing his brand. Sure sometimes he is legit angry, like in his run ins with tony G you can see he is pissed. But i would bet alot of money he doesnt act like this or atleast this extreme when the camera's arent around him.
Most likely your right,,,
" JUST KILLIN TIME,,, WAITING FOR TIME TO KILL ME,,,"