It's impossible when it's human powered. Human arms aren't strong enough, you can't get the power to weight ratio needed, or however you phrase it. I added in

It's impossible when it's human powered. Human arms aren't strong enough, you can't get the power to weight ratio needed, or however you phrase it. I added in my comment that I hadn't originally noticed the powered element of it, but like I say, even then you should assume that it's fake, because which is more likely: A guy invented an exoskeleton capable of powering an ornithopter, and kept it under wraps until it was finished, or that a guy faked the video, something for which there is ample precedent? So as a journalist you should assume that it's fake. A tiny bit of research would reveal the total lack of detail and backstory, confirming this view.