In a nutshell, Hogan prevented the hook by trying to hook the heck out of it on the downswing - but having a setup and backswing that opened up everything as wide as possible.
Absolutely, physically Hogan took it to extremes. Do everything you can possibly do to hit the ball to the right and then try to hook it. No matter how hard you try to make the ball go left it can't.
Many of us try to walk a tight rope when we play. Hitting it straight is like keeping in balance so we won't fall off the rope. We constantly make little adjustments so we don't get hurt. Hogan figured out the more weight he could throw out to the right and counter that by throwing as much weight out to the left would result in being able to walk the tight rope without falling off.
But, Hogan's real secret was mental; between the ears.