There's a whole lot of crap associated with Boyle. I view him more as a marketer than anything else at this point.
Take the trap bar statement for instance.
I like them, no doubt. But "best lower body exercise"? I wouldn't necessarily argue with that statement, but I've got to ask "for what"?
Because, it's not the best lower body exercise if you want leg strength and hypertrophy. It's not the best lower body exercise if you need to beef your hips up. Or your lower back.
It's a compromise of an exercise, and that's OK, as long as you understand why, and know what you are trying to get at.