Whether he agrees with the rule or not, he is going to have to abide by the rule or risk hurting his team. That doesn't mean he can't test the limits a little like he did during Wednesday's practice.
That brings an interesting question to mind. If he had let the ball roll off his fingers and over the bar would he have been flagged? It wouldn't be a dunk, but would a lay-up be included under the 'spirit' of the rule?