This is not a total surprise, but still quite disheartening to hear. However, now the team has been called out by one of their own, and one whose play in these playoffs so far gives him automatic credibility. Perk has been great in this postseason. I'm glad this was said, particularly if it's on target. And Perk has never opened his mouth for something of this significance before, so there's little reason to believe it's not true.
I see these comments as yet another positive step in the growth, development, and maturation of Kendrick Perkins. His stock just gets higher and higher with me.
As for the team, we can generally tell by watching whether or not they're focused. The first half they clearly weren't. Maybe one of their peers calling them out is a good thing.