hi bampot
the quote was from his book about his life and not the fundamentals, i think what he ment was get the fundamentals right and the hands dont have to be munipilated to hit the ball.
in his book the fundamentals he dont talk about anything other that hitting at hard as he can with his hands and his right elbow still bent at impact.
still think the fundamentals is the best book ever printed about the full golf swing and as you say all good golfers have a cupped left wrist (supinate) at impact but he says you get there with a good grip and setup.
i will look up his quote and let you know what page its on and if i have quoted him right.
bill