Well the reason I say it was 100% perfect luck based on his playing ability alone, is he went ahead and boasted after making the shot that it was the way he intended to play it. Which may have well been, but he boasted as if it was a run of the mill shot for his caliber of play, which I would say is a high D, low C at most.
I'd love to bet that guy his life savings that he was fibbing about the way he wanted to play the shot and then give him a lie detector test. As we say in the pool world, I'd have the nuts on that bet.
That's called a 'time shot' where the pocketing of one ball depends on perfect timing of another. If he were a three cusion player I'd say maybe, but not a D level pool player.