That's actually not what is being talked about in the article at all. I think anybody would understand that if you make money by selling off your crypto, you would owe taxes on it, that's not what the article is pointing out. The article is pointing out that you may owe taxes on the value of crypto your received at a certain time, or traded for another crypto at a certain valuation, even if you never sold the asset for fiat money at that valuation. Meaning you could owe hundreds of thousands in taxes on an asset that never made you any money at all. That really is worth pointing out to people.