It is left. That's how he gets the angle off the cushion. The follow bends it. I have a video of a similar shot and people were confused about which side spin was used. I think the video has some wagon-wheel strobe issues.
Friend of mine went to a summer session at some billiard academy in Europe and came back with among other skills, that shot but stroked such that the ball bends across the length of the table and then reverses on the bottom and side rail.
