His early journals and articles from the 80's show how he really trained to build up. It was not one set. He did various methods such as pyramid sets, straight sets, reverse sets, drop sets etc to build up. Blood and Guts the vid is just for entertainment purposes. Yates has built a "myth" around that vid but it sure was not the way he trained most of the time.
He did a three-day torso/limbs split with a decent amount of sets three days per week for years.
Then he went to a two-on, one-off, one-on, one-off split:
Workout 1: chest, bis, tris
Workout 2: legs
Workout 3: shoulders, back
Then he went to a four way split in which “only worked out for 45 minutes per week, four times per week,” with “one set to failure.”
He went to one set after he… yawn… met Mike Mentzer… and… yawn… did a workout with him and … yawn… he, as per Mike, reported to Mike, that his biceps got bigger by the next morning.