This guy is either very naive or very cunning; either way, he has a lot of guts.
In any event, he definitely punched his ticket out of New Jersey, which might have been his plan (see "cunning" above). He doesn't dis the talent of the team and he specifically avoids dissing Rex directly. But, saying the locker-room is out of control falls squarely on the shoulders of the HC and, on most teams, its QB.
He'll definitely have to work to build the trust of new teammates, especially since even Jets players still have some friends in the league who won't like this. But, all in all, probably better to take an action that leads to getting out of town than staying on a ship that will continue sinking until the Ryan/Sanchize error is over.