The book is splattered with drills and TGM in layman's terms.
In one of his appearances, I made the connection but only after studying TGM and just happened to have his book. My copy is a Copyright 2003 PGA TOUR Partners Club from a used book store at $1.99. There is a "Garden Chat" introduction in the book where he acknowledges different instructors but nothing on TGM.
One example of "TGM in layman's terms"
Keeping the right wrist bent is associated with keeping the body engaged in the shot. With the left hand removed and the right hand just above the shaft, a small empty water bottle is placed between the grip and the wrist-forearm area to "set the correct wrist bend needed." Swings are made without crushing the bottle.