Just from having read the blog post, I would say that is an excellent way to ruin a horse and get someone hurt.
Using a cordeo allows the horse to make a choice: whether to listen or not. He learns that if he doesn’t want to do something, you can’t make him.
That's fantastic *eyeroll*. What happens if you're riding the horse in the neck rope, he gets spooked and takes off at a run and decides he doesn't want to listen when you try to turn him away from the huge ditch or the fence that he's running right toward?
People buy into the whole "be gentle/kind/soft with your horse" thing way too much. Now, don't get me wrong, I am not one of those "beat them into submission" types...far from it. It's just my belief that being a good horseman doesn't come from attempting to use only items that can never
ever hurt the horse or force them to do anything.
Being a good horseman means working to gain the knowledge and experience and ability to use whatever you want on them from a neck rope to a spade bit and being able to make one just as easy on the horse as the other.