What you're highlighting is that art's value proposition is different from the value proposition of typical businesses. But not that artists are somehow free from having to worry about basic economics.
Many artists would rather blow up their careers than make work solely for business reasons.
There's a huge cadre of content creators and entertainers who are happy to do that, but - as the previous post says - their work is typically entirely forgettable. Even when it's commercially successful.
And successful original creators usually have business managers to deal with "basic economics."
The ideal for most artists is complete creative freedom and an open budget. Not many get there, and not everyone who does get there produces something memorable. But it happens occasionally, and it's usually far more interesting than create-to-market content.
Again, you're arguing a distinction which the author agrees with. From the article:
> Most people who enjoy making art should not try to make it their full time job. When you turn an avocation (hobby) into a vocation (job) you have to do new things you do not enjoy.
I think perhaps you're getting hung up on some semantic quibble rather than focusing on the broader point. "Artist", "professional artist", "artist for a living", "someone who spends most of their hours making art but also needs to eat". Choose whichever term satisfies your complaint. These people need money to live, that's just how the world works.