I would assume, the original video was a cobbled together system held together with sweat tape and prayers, intended as a proof of concept to show that the board can do it. I would assume, they did that to show the goal, and then tried to get it to do that through proper implementations and through a system that will not fall apart after 1 reboot.
Such proof of concepts are actually quite common.
But as I have not done much research into that video, I cannot guarantee that’s what’s going on.