I'm in the middle of this right now, just did ten more racks (plus QB) yesterday.
I'm up to 55 racks/880 balls of stroke practice.
I can feel it working for me; I am starting to "groove" my stroke, and can tell when I am not executing properly. I can tell when I am jabbing at the ball, or not following through, or not staying down.
What is daunting is his admonition to not play while you are doing this drill. I have to admit I'm not doing as he advises; I HAVE to play! You know how it is!
I have noticed an improvement while playing, particularly with across/up/down the table shots, whether there is lots of green between the QB and OB, or when there is lots of green between the OB and the pocket. When I execute properly, I make the shot more often.
I think it is working, so I will see it through to the end, and plan to do it at a reduced level for as long as I shoot pool.
I'd advise people to at least try it for ten/twenty racks or so, and see what it does for them.