I didn’t watch the video, but I always imagined this...You fold a piece of paper a bunch of times, it gets super strong...Why not kevlar or steel? And then you press it to make it thinner, and do it all over again. like a samurai sword. Great bulletproof armor. Or tank armor, or...
I saw something on TV the other day where someone invented an origami bike helmet. It actually looked like it held some merit. The idea was that it could fold up for small storage, great for bike commuters.
When I commuted, the helmet on my desk took up a lot of space.