You might want to actually watch the video again, carefully. The motors and hydraulics aren't even hooked up FFS!
I've watched it a few times. I can't comment on the mechanics except to say they do show the motors functioning in one shot.
The headband is just random junk, it's not picking up his brainwaves.
It only takes a couple of small metal discs to pick up "brainwaves" or scalp muscle activity. I can't tell exactly what the other stuff is - can you?
He even talks about how when you put on the headband and close your eyes, you see four colored lights appear in your head, which is how you control the arm. That sounds completely feasible and not made up in the slightest.
Actually it doesn't sound make up at all. People who are taught biofeedback techniques often describe very similar sensory experiences they use to gain control of whatever they are learning to do.
Funny too that none of the reporters and other visitors who have tried can get it to work, besides him of course.
Well, duh - he says it took him some tome to learn - which is typical of biofeedback type skills, learning to create brain alpha waves at will, or would also be expected if learning (without realizing that what you're doint) to precisely control scalp muscle activity. (the sensory experience of closing eyes and seeing lights would just be the cues he has developed to do this).
Creating a metal brace to hold his arm in place can be done without 10lbs of extra junk and without a headband. (True enough - but how do you then control elbow flexion on demand? If you have to use your other hand (to push a button for example) it would interfere with any work)
He's either:
1) Faking it for attention.
2) Had temporary paralysis which is now gone; in which case see (1).
3) Isn't actually paralyzed but still can't normally use his arm, i.e., a psychosomatic cause.
All possible of course but what evidence do you have other than your lack of understanding of how the technology to might work?
4) Does actually have paralysis and actually built a working bionic arm controlled by his thoughts from a collection of scrap metal and discarded consumer electronics.
No one is claiming hs is controlling anything with thoughts - that statement just means you don't understand how biofeedback techniques work. Controlling general EEG patterns is not that difficult - controlling small scalp muscles (even without realizing it) is even easier.
This company even sells headsets that high school kids have used to control robot arms.
What I think we most likely have here is western Engineers looking at a sensationalized press report of a guy who has creatively found a way to get some minimal function of of his arm after a brachial plexus injury. He used junk he had on hand an his limited mechanical and electronics skills to create a solution that may or may not be working the way he thinks it is. There's a lot of extraneous, bodged hardware - both mechanical and electronics on there that he may have tried out and just not removed - in prototype fashion.
To a western Engineer - expecting a neat and tidy device - (and to whom control with brainwaves seems like magic - it's not) -it all looks totally unrealistic - but anyone who's spend significant time in the 3rd world has seen third world solutions to things that at first glance seem completely improbable but somehow actually work.
I think we've all become too jaded by the Batteriser, Airing and free energy, etc type scams and always assume the worst!
I'm not saying this is totally legit - all we're seeing is a short clip and typical media nonsense hype reporting - BUT what I'm saying is that it is completely realistic that someone with limited mechanical and electronics skills could patch together something that would allow using "brainwaves" to create a binary control of something like a motorized arm brace that allows elbow flexion - and if done in a third world garage it might look similar to this - which is all I see being claimed in this video