There could be a secondary joystick, but if the placement of the input "boxes" around the head are anything to go off of, I'd guess each "box" has a tiny button you hit with your head to move the arm a little bit.
Edit: I watched parts of the original video a few dozen more times and am convinced the helmet is 100% nonfunctional junk.
The whole thing is about as believable as this old one: https://www.fastcompany.com/3029876/this-nigerian-college-student-built-a-wind-and-solar-powered-car-from-scraps
This nigger has a wind turbine in his VW..... it's in the fucking boot and it spins when you drive down the road to charge the batteries. These people are fucking stupid.
I studied thermodynamics and while I don't remember everything, I do remember you can't get more energy out of a system that you put in it. If you could get out more energy moving something through a medium than what it took to move the thing through the medium, that would solve all energy problems immediately.
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