Sorry I can't stand the man and have no use for any of these techniques
All horses have a threshold for being bored, exhausted or being defeated when run around a round pen so the 'join up' he uses achieves nothing long term. Its based on the prey/predator approach and not trust and willingness
Someone posted a video on a thread recently of him getting a horse backed in a few hours - that is not the way to train a well grounded horse that's going to remember what its learnt. It would have no clue how to transfer verbal cues to leg/body/hand cues.