The author is oddly (suspiciously?) hostile towards AI. I get skepticism, but this piece is awfully reminiscent of the "internet has peaked" naysayers of the early 90's.
Reminds me of the Upton Sinclair quote about not expecting someone whose job depends on not understanding a thing to understand it.
Yes, it's more efficient, and more productive, but not every job is like software where the only relevant measure of quality is how quickly you can get a minimum viable product to market. Some things are worth the effort and craft.
It's really not so different from a synonym dictionary. Just a lot easier and with better context.
Also, many writers don't enjoy it as such. Sometimes it's just production. Think of journalists asked at the last moment to cut their page-long piece to 800 characters. Instead of spending 20 minutes cursing the editor and their mother and then settling into the work they can now whip it into the LLM and check it. Or marketeers having to rewrite a bunch of corporate drivel for a different target audience.