The amount of crypto used to buy things is similar in scale to holding a fistful of sand up to the weight of all sand on earth and loudly proclaiming “not ALL sand isn’t in my hand”.
The article is literally presenting the case that crypto is ALL a scam (emphasis not mine). Obviously not true, and attempt at logical argumentation in article is painful.
And the amount of M0 US dollar money supply used by normal people to buy things to live and enjoy life is paltry compared to the greater speculation and non-currency US dollar money supplies. It doesn't mean an actual US dollar isn't a currency.
Not entirely sure what point you're trying to make, but I use USD to buy things to live and enjoy life, yet almost none of these USD are in M0.