That was the right call. No one was stopping him standing up but he won't and then he puts his hand on the puck to throw it out of danger. That should be called every time.
My guess is that if you took 10 guys who played the game well, and for any length of time, such as Messier, Shanahan, Iginla, Sakic, Scott Stevens, etc, and you showed them that play, they would all agree it was a stupid call.
The guy was crosschecked down, on top of the puck. He wasn't in the crease or near the crease. He was being jacked up by players trying to reach under him. When he finally did reach under himself to try to move the puck, it was absolutely not 'in an effort to conceal,' or whatever the rule says, but rather an effort to get the damn thing out from under him. That was piss-poor reffing. Not that it was crucial to game outcome. But I think most coaches, GMs, players watching that play would find fault first with the ref or the rule, not Seabrook.
But I could be wrong. It wouldn't be the first time.