What do you think broke his spar? It had to have been something more than a jibe, I would think. At the start of the sequence he was going wing on wing. Then the jib went over and finally the main jibed. But the jibe didn't break the mast - The upper portion of the mast broke a bit later, followed by the lower half disappearing. And the mast at the time it broke was not immersed. So was it the jibe or the water that broke the rig?
The pictures really show the problem with aerated foam. It doesn't support anything - either a boat or a person. Rather than popping to the top, the aerated foam rolls over the boat without lifting it. Moral: Stay out of surf!