The one in the YouTube video looks very similar to (or exactly like) one of the designs from one of the Klutz books around the turn of the millennium. I might’ve found it in the Explorabook? I’m pretty sure they called it the best paper airplane you’ll ever make, it even had the same wing flaps.
It also looks almost exactly like one in the cover of the paper airplane book:
Klutz Book of Paper Airplanes Craft Kit https://a.co/94zUS0G
Turns out Klutz might’ve printed quite a few paper airplane instruction manuals.