Ok - my apologies then.
I don't know either. Someone on this thread is making it seem like it's some super Kamehameha ninja move that shall not be spoken of, while others are saying it's just dynamic combat. Googling the term brings up everything from people calling it a gamebreaking bug and exploit to it's just a technique of breaking the animation to get in a few extra swings in a shorter time then letting the full animation run through its rotation.
I looked through the vid several times and I really couldn't identify any things that looked out of the ordinary (besides the size of the crits - good job Cetus BTW) so I'm in the same boat as you.
I dont know what is being referred to.