Commentators and pundits have a lot to answer to. They should be required to learn the Laws of the Game before being allowed to cast judgement on incidents such as this. Actually, any self-respecting professional commentator or pundit should of their own accord learn the LOTG, and it wouldn't do them any harm to referee some games too.
Former footballers or managers turned pundits really have no excuse for not familiarising themselves with the LOTG though. We often see these so called experts randomly saying it should have been a goal, or it should have been a red card etc., but with nothing to substantiate their view.