Reading the article, I would say its more of comparing unrelated items and from that trying to make one looks good more than the other. Visa is a payment company just like MasterCard or PayPal that enables people to have access to their money for those who relies on the debit cards as against the credit cards which you are allowed to spend more than what you have.
Cryptocurrency on the other hand is not just one company but series of coins being valued. Now comparing a ton of coins with a company and saying one is better off, is just an uninformed conclusion if you ask me.
It is an apples and oranges kind of comparison in that you are correct, but since bitcoin and altcoins are completely different than anything that came before that is the only kind of comparison we are going to get, however even with all the transactions being settled in all the cryptocurrencies we are still far away from visa, that tell to us there is still a lot of growth for bitcoin in that area and when we reach visa in that aspect as well the whole market of crypto will probably be worth trillions of dollars.