Who knows. IMO it was mainly because he was our version of Cool Hand Luke. There was never an official explanation, because it is not the policy of the officials to provide an explanation.
He has a background in commercial spearfishing. Many people who spearfish commercially have an approach to diving that is not considered safe when applied to recreational dives, and that's certainly true in his case. I have a great deal of respect for him, and consider it unfortunate that he and the moderators were unable to find common ground.