I have a feeling the author framed this the wrong way.

my take is - the author wanted to express that there's always a demand for human prose / writing that captures the subtleties of expression, thought & ideas. which is very true. & we can already see this e.g by people opting out of LinkedIn for it's A.I driven long posts. whereas engagement is high on X where posts are likely to be human generated.

I wouldn't say writing as a job is protected - as corporations will always take shortcuts.