I had some trouble understanding what he meant by that until I had a horse like you are describing.
It is not enough to just run them around in a circle.
They have to have (for lack of better words) some kind of purpose to it or find the joy in it.
They get stuck and there is not a whole lot you can do to unstick them.
They have learned to evade by just stopping.
The more pressure you put on them the more they leave until you have nothing to work with.
I had a horse here that the owner had tried to use a backhoe to load him in a trailer and the horse still did not move.
I would suggest starting alllll over and work on what you can get done and take as long as it takes.
It is going to be harder than starting a fresh colt out of the wild and you need a lot of time.
I got the horse loading but it took 5 times longer than any other horse.