The point made in the article was about social contract, not about efficacy. Basically if you use an llm in such a way that the reader detects the style, you lose the trust of the reader that you as the author rigorously understand what has been written, and the reader loses the incentive pay attention easily.

I would extend the argument further to say it applies to lots of human generated content as well. Especially sales and marketing information which similarly elicit very low trust.