I did not think much of it -- yappin' dogs or horsemanship either.
It is pretty crude with no quality of movement or results. Absolutely no attention is being paid to the details that give you a good, consistent side-pass where the horse has his head down, crosses over in front of both front and hind feet. The horse should not show irritation or resistance. A good side-pass should be deliberate, one step at a time, each foot crossing carefully over the other front foot, head down, mouth closed, tail not wringing and other resistance not being shown.
The horse is being nagged and pecked at and repeatedly being literally chased for many steps without any release of pressure for a step well-taken. Under saddle he is being pressured even more and forced to go 'somewhere' while being literally run into a fence, throwing his butt for side to side to escape, fighting his head and would have absolutely blown out of there if the fence was not there. This is not training or teaching a horse to do something. This is forcing one to do something at its worst.
I had used a fence to teach side-passing (mostly opening and closing gates) -- about 45 years ago. I was not happy with the quality of the results. I started doing more 'teaching' of leg yielding maneuvers.
I start by teaching a horse to move off of my inside leg on about the 3rd or 4th ride. I start using my inside leg when I start jogging circles on a colt. I also start using outside leg if a horse does not follow its nose the way I want it to, but that is pretty rare. It is mostly the inside leg that I start with. I start pushing a horse over BEFORE I change directions, as in a serpentine. I use my inside leg more in the beginning so that I can teach 'guiding' without having a horse learn to drop it shoulder and fall into its circle.
Then, I start making a half circle away from a track or fence and 'pushing' the horse back over to the fence or track while trying to stay parallel to it. When I can do that, the horse will side-pass one step or 20 steps, with its head down, no anxiety, no fight or fuss, no tail wringing, no trying to escape -- in a word -- no resistance. The very first time I now try to open and close a gate it would look like I had done it 100 times on that horse.
So, no, I would not consider this video to be anything but crude and an example of how you do not want to teach something.