Yes, that's pretty much it Chisamba. You don't have to trot, but it's a bit of pressure on the horse when they go to the spot they want, and relax that pressure as soon as they move away. You can steer in a circle (circle even at walk is harder work than stopped) at that spot and pretty quickly that circle starts to bulge away at a point and you release the pressure (eg slight leg pressure) at that bulge. I found it quite interesting.
I don't think he would start straight up with this with Deneb!! I wouldn't be convinced with her either, and he will admit there has been horses that he hasn't been able to solve.
The biggest thing with his training for me, was being able to get my big horse to relax.
I found that his detailed vids and explanations gave me an insight into horse behaviour that I was previously oblivious to. You might already see and know all the things he points out, but for myself and many others hadn't.
This one is a good example of the gate/barn addiction (and is a dressage horse)
https://youtu.be/0CCBYissnY0