The biggest misunderstanding that crypto critics and even many advocates have is that Bitcoin is a currency that people will buy stuff with. If Bitcoin has any use, it is as a final settlement layer. The Lightning network that is layered on top of Bitcoin is what is actually useful for buying stuff. Much of this article is based on this misunderstanding.
A correct criticism is that Bitcoin can be controlled by pooling mining. But a more nuanced take would be to say that it is a system that works due to aligning the economic interest of the miners providing the decentralized security with the users. The real problem with government fiat currency is less the centralization but more that the centralized actor is incentivized to monkey around with it, and particularly to devalue everyone else's money by printing as much new currency as they can without creating rampant inflation. With Bitcoin, miners could attempt to control the currency, but then it would lose all its value, so they choose not to. It's certainly still a risk to the system, particularly when one nation state like China previously did most of the mining.