Seems like mostly mystique to me. Can't even find a good description of what the fundamental ideas are, aside from 'left hand behind the ball at address, sweep lt back, hit up on the ball, keep it simple.'
He had a book, which you can get on amazon for 200-500 bucks. There is a guy named Nicholls who will apparently teach you everything you need to know about it for some number of thousands of dollars.
The stories about how he played sound vaguely Kim Jong Un-ish, with scores in the mld-50s, 18-hole rounds accomplished with 14 total putts, etc.
He's a golf mystic. The Shivas Irons of north America. There isn't much footage, but his swing looks a little bit like Freddy Couples.