I watched about half of his interview on Joe Rogan. The point at which I turned it off is when he started saying that the detection of gravitational waves proved him right. He went on to say that in the 80s everyone in physics thought that gravity came in gravitons and not gravitational waves, but from working on this alien spacecraft he knew that there were gravitational waves, so the discovery of gravitational waves was confirmation.
That's just ridiculous. Gravitational waves are a straightforward prediction of general relativity. Their experimental discovery is groundbreaking, but no physicist was surprised that they exist. They are also completely consistent with the existence of gravitons, in exactly the same sense as electromagnetic waves are consistent with the existence of photons.
So either he doesn't understand physics or he's ********ting.
He said a bunch of other things that probably sounds reasonable but that make no actual sense, but that was the last straw for me.
The video linked in the OP is supposedly an analysis of his body language to determine whether or not he's lying. I think there are better ways.