I think the tweet author is missing the meat and focusing on the gravy - they themselves indicate that the AI just replicates existing styles, so it will only ever produce existing art styles with the signature AI blurry weirdness on the details.
A main hallmark of breakthrough artists is inventing new styles and making them their own, a feat that AI has yet to perform very well (unless you include the aforementioned blurry telltales of generation and scrambled letters). Otherwise artists are just borrowing ideas from each other anyway so AI removes the need to learn someone else's style to replicate it.
In my opinion it will hurt the bottom tier of artists, but the ones who create new styles along with their own works will continue to thrive.
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