> The real success story here is N. K. Jemisin who was earning $5,068/month publishing fiction on Patreon before she received a traditional publishing contract and went that route instead. But she is the only real case study we have.
In particular, this line rings false, considering Wildbow is currently publishing fiction at $6000/month and has been steadily growing for years. Taylor Fitzpatrick[1] is publishing fiction at a per-story rate, which is harder to calculate a strict number for, but could easily be up there. SenescentSoul[2] is making at least $5000/month, but doesn't show the actual number on their patreon. I could go on; although I've read Wildbow's work in the past, I've never heard of the other two, and just found them by searching "writing" on patreon.
Of course, none of these are strictly writing novels: Wildbow is a web serial author; SenescentSoul appears to be the same, and the other is a short story author. This is perhaps why the author (intentionally? unintentionally?) seems to have left such a large area of successful fiction writing out of their article.
However, not mentioning the huge success of self-published LitRPG, romance, web serials, etc. in an article that is centered around positing the question "Could the creator economy work for fiction authors?" seems like a rather large oversight to me. None of these people mentioned are making the prized $10k USD/month that the author holds so highly (although [2] might be), but they're all extremely successful even relative to the world of traditionally published novels, and they're far from the only examples.
I understand that this author is quite focused on novels specifically, but self-published novels from romance/litrpg authors can also be quite successful; this is much harder to find numbers for than patreon-based authors, of course, so this is only an anecdote.
[0] https://www.patreon.com/wildbow [1] https://www.patreon.com/imogenedisease [2] https://www.patreon.com/senescentsoul