"Ponzi schemes are bad. Bitcoin is a Ponzi scheme. Because I say so. See, they make memes about it. There's a Dogecoin. Such fraud. So Ponzi."
All he does is make a bunch of associations between Ponzi schemes, which are criminal enterprises where a central controlling authority or individual creates the illusion of profit growth by paying out older investors with the funds from newer investors, and Bitcoin, which is a virtual asset which is fungible into every currency on Earth, and whose value is determined by what the market is willing to pay for it, not the whims of any central controlling anything.
Sure, it's a bunch of words that sound really scary. But, being as Bitcoin is not a Ponzi scheme by the very nature of what it is- a market exchanged value store driven by a consensus network- it's not valid.