I knew about that, I highly disapprove. You can teach a horse to do that step without hurting them, I am sure. It may not be as fast, but horses like to please and will eagerly learn things if approached right.
At least her in Canada (and it was supposed to be in the states too, for more than the last 6 years) It’s actually illegal, but that doesn’t meant some stupid humans don’t still do it. I didn’t actually look at the link, just it’s title so I don’t know if they also included the variant that involves the Shoes. Some of the shoeing styles I find ok, or fine, but some of them are very little better than the actual soaring itself.