Why wwould you ask a player if he removed his shirt, you either see that he has, or did not see him celebrate with it off. There would be no reason to seek clarification from the player himself. Why ask the player and not one of his assistants, maybe he did not trust them to make that call...
So the assistants did not inform Martin Atkinson that he had taken his shirt off, and the fact Martin Atkinson had to ask the player if he had taken his shirt off, when everyone else had noticed is embarrassing to say the least from the officials. Maybe they will retire from officiating...