I count 84 people listed as permanent staff on the website, which is not something I'd call "exceptionally few". And I'm not criticizing the fact that people are permanently employed; more power to 'em. But as Pica_soO says, things change once it's your paycheck.
Consider the difference between "music" and "music industry" for example. Or the difference between coding on one's personal open source project and coding on somebody else's dime. Consider how many startups compromise their vision to become commercially successful. Or go talk to somebody at an ad-supported site; you can hear them defend things (e.g., auto-play video ads) that they would have previously reviled.
If people don't like how a hobby project is going, they have no problem shutting it down. But once it's one's living, that becomes almost unthinkable. Which in turn means that other things become almost unthinkable.
So my criticism of this article is that it's basically an exercise in refusing to think about the legitimate issues people have with what Burning Man has become.