The video proves that the producer of the video has no idea what vinyl is actually doing, or the fact that the recordings were likely made on analog tape which doesn't have that bandwidth either. Look at the levels involved, and where the ultrasonic information is relative to the audible...
This is an interesting discussion, but it seems a bit polarized in the sense that (as usual) two-channel stereo or mono are both somehow considered "true" or "pure", even if other words are used. There are problems with both.
Early stereo experiments at Bell Labs in the 1930s concluded that...