The bad thing about editing is sometimes we aren't given all the reasons why a rocker is eliminated. Luckily, there are people who attend the tapings and post about what really went on!
Phil was eliminated because of an article that came out last week where he basically said he didn't like the Supernova tracks he'd heard.
Article In the elimination episode Tommy questioned his dedication and whether he really wanted to be in Supernova, not just to win the competition. The article is what he was referring to.