He doesn't have to mention a name to be criticizing the refs. We found that out in 2010 during our home/home series, where a near-last-second game tying goal was washed on the goaltender falling over. During the press conference, the coach stopped the press questioning players about the call (obviously to protect them being able to play) and showed a video of the play with no comments. However, when it was the coach's turn for a press conference, when asked if he'll hear from the league about showing video, he said "the refs should be concerned", which drew the suspension because he called out the refs directly on messing up. And unfortunately, since Ernst tagged the official ECAC Hockey twitter account, that's an immediate red flag to drawing attention.