Yes, MB does advocate this and I think Joe DeFranco does, too. “Why run more than 40 yards?” is their mentality.
Another Boyle gem is he feels you only need to train 0-20y in preparing for the 40y.
I don’t have a problem with athletes not back squatting and/or trying to drive up single leg squat values. I’m just tired of MB thinking he’s re-invented the wheel.