"The purpose of the hangboard is to train your forearms, and body builders have long understood that the best way to train a muscle is to isolate it."
body builders are concerned with muscle growth, not functional strength.
"Compare it to the opposite style of climbing, the very steep, “thuggish” routes of Rifle, American Fork, and Maple Canyon. Those routes depend mostly on endurance, and very little on strength and power."
i wonder if he has ever climbed at af or rifle? sounds fishy....
i could go on and on, but i will say that many climbers would surely improve following this guy's advice (or a number of other climbing "teachers").