In two words : Milli Vinilli
Yeah, new Milli Vanilli Wannabees. Bzzzz 
This so bad. Even his fake moves are wrong, as anyone who has ever played a Theremin will quickly realize. It doesn’t even sound like a Theremin. But hey, if some novice wants to rush out and buy a Theremin believing that it’s that easy to play, that can only be good news for Moog Music business ! 
“This guy’s got a hurtin jib” Ha, I’m going to steal that.
I thought they were funny.
Walk the Earth is actually a pretty cool concept. I checked out some other vids from this guy. 
And yeah, he’s actually playing the Theremin. 