I've watched this video. He makes whips that suit his performance style and I have nothing bad to say about that. Whip making is like many other human endeavors-there are many ways to arrive at a desired end. What works for you is what is important.
I've made whips that are bound tightly from the core through 3 bellies with closed-loop binding, I've made whips that have no binding whatsoever, and everything in between. Cow whips and stock whips actually seem to work better with less binding. I have a bullwhip from Blake Bruning that has very little binding and the transition is still very stiff. I have a whip of Bernie's that has moderate binding (if it is made the way he shows in his videos) and it is a lovely, heavy, slow-rolling whip. I've made cow whips and stock whips with little and no binding at all that I think perform superbly. I've got an 8-foot bull that I made when I first started, that has electrical tape, carpet tape, and 3 bellies, all bound tightly. It is still one of my favorite whips to play with.
I've changed the way I make whips over the last (nearly) 3 years, always trying different things, always trying to make a better whip, always trying to learn, always trying to make something I am proud of. Everyone has something to add to this wonderful hobby, and people that are willing to share what they know are a relatively new thing in the whip making world, so I am always willing to look at what they have to offer and see if it fit into my style.
Having said all that, I have to say that no one, anywhere makes better whips than Rachel. she is my hero, my inspiration, and she set the bar on what I think a whip should be. I love the whips I own from Jessie and Jyri and Collin, but the little stock whip I have of Rachel's is the best whip I own, and that includes the ones I own from Bernie and Blake. I should have a whip from Glen Denholm in my possesion soon, but I do not think that it will usurp the little stock whip that i got from Rachel.
The point, I guess, is that everyone has different needs and ideas of what a whip should be. It is very much a personal preference. Find what ever suits you and grow from there.
Diagonally parked in a parallel universe.