IMO he was doomed when he touched the front tire down with the tire a bit to far off center. That's what started the wobble which quickly hit the stops into a full on tank slapper. From watching the video, it took only a fraction of a second for the wobble to turn into a tank slapper and only slightly over a second from the time the front tire hit the pavement until he was pitched.
First, there was not enough time between tire touch down and the bars hitting the stops for the brain to process the situation much less time to process the info and get WOT. (If he were doing the wheelie properly he should have been at or near WOT when he touched down)
Second, if you have ever had a stop to stop slapper you know there is no physical way you can twist the throttle with the bars slapping the stops that violently.
Third, the time spent from tire touch down until he was airborn was just slightly over one second. When he touched the tire down he was doomed. Nothing he could have done to save himself during that very short amount of time.