I think there is an extremely good chance that DeBoer lost his job last night. Absolute disasterclass in managing your goalies.
I think it was stupid to pull him at all. Those two goals were certainly not soft and both were from complete defensive breakdowns in front of him. I can see an argument that he didn't look like he had his A game, but I think he's good enough that you give him the benefit of the doubt. But if you want to lift him, he did it just about the worst possible way.
He completely wasted his timeout. Putting in the backup (especially early in a game when it is unexpected) basically gives you a free timeout. Make sure the trainer takes a little bit longer than needed to grab the helmet. Make sure DeSmith knows to adjust the strap on his glove while he waits for the 'right' helmet. If you're changing the goalie early in a game that is getting away from you, at least do it so you keep your timeout.
Did it change the momentum and wake the team up? Nope. And then DeSmith promptly allowed a puck to get through/under him as he was blindly sliding around trying to find the puck and the game is 3-0. No timeout remaining, your worse goalie in net, and an even deeper hole. Incredible work.
And then post-game he throws Otter under the bus instead of giving the easy "trying to change momentum" answer. Franchise goalie is almost certainly super pissed and the coach threw gasoline on the fire instead of backing him publicly. Just brutal.