Be genuine to yourself, this is a clear penalty. Arm away from body, inside the box, stopping a possible assist. It does not matter what you "think". These are the facts. And it is disgusting that he did not use VAR to check on this. Referees need to stop having an ego and start using the tools given to them to make the game better. These are the types of mistakes VAR is meant to avoid when it is USED. Sickening to see this at the highest level of the sport.