To go back to the start, it's about what the author of the article said. And the author of the article made the claim that you aren't making a living wage as an author unless you (a) are working for a known publishing house, and (b) are making over $250K a year. It's so absolutely absurd on face value that it's not even worth discussing further at length. You don't even have to do any real research to know that this is incorrect.