In a sense, yes. I like the fact that Dunn tried for it. Motzko afterward said he loved the attempt as well. But during the game, the fact that Dunn looked over to the bench after the attempt, noticing Motzko's look and having that initial reaction of "oh crap, he's mad" is a signal.
I have been in the same position as an athlete and a coach. Like i said, Motzko's external intimidation (what initially sparked the Dunn "oh crap" moment) and his straightforward tendencies can do that to people, make them play scared, when they don't entirely understand his coaching approach to the game. So when Dunn says he looked over, that tells me that wasn't the first time. When he said the reaction wasn't good in his eyes, that means he's done it before in not so good situations that have had not so good outcomes for him. So in a sense, he is scared and playing scared. Obviously, that doesn't mean he's shaking in his pads out there. It's just that he is questioning his abilities and decisions just enough to have those kind of reactions.
I think Motzko's vote of confidence from that quote tells us that likely after the game he told dunn in the locker room he approved. I wouldn't be surprised if they got a good laugh out of the attempt because goalies don't get those kind of shots that often and Dunn put a pretty good shot down the ice.