I've seen it in freestyles and done it. As SCMSL, I do it all of the time, too. It's a pretty easy move to do one handed, unlike others, and is actually a good exercise to practice.
I noticed in the video he used a move from, whats her name who used to be the freestyle queen way back, from the Horse in Sport video, which is a walk pirouette straight into canter. That is a lot harder move.