He's a market manipulator, or was when he was in that hedge fund, and there's every reason to believe that he still would do this now for his own personal benefit if he could. Basically, if he's promoting a position it's probably a really good idea to strongly consider taking the opposite one, or just ignoring it (which is likely the better idea).

it's just so over the top! if you haven't seen it before here's a recent one https://youtu.be/RKG0Qh51Vq0

The fact multiple ETFs like this exist should tell you all you need to know.