I don’t know the iihf rule book but it’s actually quite straightforward if you look at it through NHL eyes:
- team A commits penalty
- play is live for team B until team touches puck (delayed penalty)
- whistle blows
- team A to box. Team B to power play
So if the call was
- trip by US goalie
- arm goes up - called penalty
- US was first team to touch puck (goalie)
So if that’s the case, it’s accurate - once goalie touched the puck, the play was over. The shot that went in technically never happened.