The statement was a bit hyperbolic, but not by much. Have you ever used cryptocurrency for any routine transaction? How much total money have you spent in cryptocurrency if so? It's very newsworthy when people like Elon musk say they will accept cryptocurrency for the very reason that most businesses do not. And I would be surprised if more than a handful of Teslas have been sold via cryptocurrency.
Musk has already backtracked on accepting crypto at Tesla, citing environmental concerns. A cynical person might assume that it was just a publicity stunt in order to pump bitcoin.