Ridiculous. Pyramid and Ponzi schemes do absolutely nothing other than redistribute wealth. Bitcoin obviously has some value and if you can't see that you're willfully ignorant. The article suggests that Bitcoin "promises insane returns" but Bitcoin doesn't do that at all. Speculators want you to buy so the price goes up, just like a stock.
How does that make Bitcoin a Ponzi scheme? A ponzi scheme is an organizational structure, not the people that exist in that organization. Bitcoin is a piece of software, and some people using that software are trying to profit. There is nothing inherent in the structure of Bitcoin that makes it a Ponzi