If he was he must have just stepping on or skated back to his blue line because he was not in the Blues zone when the 4 penguins regained the pucks and took it in to score. I think he's in the background somewhere.
Had another look. You cant see him when the goal is scored but then afterwards at the celebration he is there, so that is where the plus is coming from. Thought he was off the ice when they scored.