All you gotta do is look at a highlight to see how awful the goal was. Yeah, I know it's weird but sometimes goalies have mental lapses that make them look like they've never played the position before occasionally.
He didn't look like a beer league goalie all game, just on the goal. It was a backhand that hit the center of the net from a poor angle. He made himself extremely small (only took up the lower quarter of the net).
Go watch it. It's Tyson Barrie's goal.
Also, don't forget Cloutier let in a goal from the opposite side of half that again, most beer leaguers could stop. It happens.
Edit: I'll save you time since you don't wanna actually watch the games and pretend you know what you're talking about. Go to 2:20 and tell me a beer league goalie can't stop that shot.
Edit 2: I'll even upload a screenshot of the puck hitting dead center if the net (with a circle to point out where the puck is) from a bad angle to show how awful his positioning was.