How pure it is, depends on the skill level of the person demonstrating it. I would say in the grand scheme of things it is very low level.
I will try and get some video for you.
There is a second method too, and I will take some video.
Great! I'm look forward to them! Honestly, I've been playing with the idea of raising my arm, without activating my shoulder all day, I find it impossible. I would be pretty impressed by this.