I'm pretty sure John played the shot with lots of right and a little draw. I don't see the cue ball changing speed abnormally after the shot. It may help to view the video at normal speed.
There has been a lot of discussion about this, but I would put up this challenge to anyone. If anyone thinks pure spin curved the cue ball toward the upper right corner pocket, than it should be reproduceable, on a level table. So far, nobody has come forward with that.
Also, the opposite case should be demonstrated, that is, with a break shot to the other side of the rack, with left english, a liittle draw, and the spin should curve the cue ball to the opposite corner pocket, the left one in the video.
If anyone can demonstrate that, I might be a believer. But, I have my doubts, measles spots and everything. If it's really reproduceable, any cue ball would probably do it, spots or otherwise. I doubt John went into the "contest" with a worn cue ball.
Much talk about horizontal spin versus vertical spin. But I would still say, someone reproduce what happened on with spin before jumping to conclusions. I personally think table anomaly can happen any time, even with a level table, a few specks of chalk dust, maybe somewhat of an air current, etc., the cue ball can roll off. But, keep an open mind.
All the best,
WW