I don’t think it has to work on every single yoyo to be legitimate (…daniel…). Not all yoyos are suited for all types of play. Good luck doing horizontal with a good number of yoyos out there, and have fun doing chopsticks with your H5 (not impossible, but…).
I laughed when I saw the video because I was so pleasantly surprised! I think it’s pretty cool and could be introduced at least a little in a freestyle/video.
I was also pleasantly surprised only one guy gave an answer like this: