But his system was pretty bogus.
It's a funny thing, our game. The contact point between CB and OB is invisible at the moment of truth (it's sandwiched between 2 balls), and our eyes are not calibrated to judge the millimeter differences required to change a cut angle a few degrees left or right, anyway. Players, even excellent ones, don't really know where they hit the OB; only whether or not it went where they wanted.
It's a funny game where the judgment of aim can be performed in a precise and systematic manner, with systems varying from suspiciously simple to hideously complex, but then the actual delivery of the CB to that line of aim is a feat performed by the subconscious nervous system in a way that makes it dubiously relevant how the "aiming" part of the process was performed.
It's a funny game where geometry and physics decide the results, but factually incorrect geometry and physics can still guide a player (even at the pro level) to achieve their desired results.