This is essentially what I do when I strop, but somewhat different. I do maintain a certain angle of the razor relative to the strop as in your demo. But as I've posted many times before, with videos and illustrations, I use a sort of arcing motion, kind of like a windshield wiper blade. I think it does pretty much the same thing as what you have demonstrated.
You stole my line. I was going to say it's windshield wiper stropping. That's the way I've always done it. The only difference is I don't keep a fixed angle as it changes as I strop.