I think his “ALL AUTHORS” point was about how authors will use AI in some form or fashion during their process, and points to how he did with his google search and his AI Gmail response. I don’t think he meant all authors using AI for their writing. Here’s the snippet:

“Another thing that will happen is established authors will turn to AI for assistance, not just for writing but for research, cover art, editing, returning emails, having an assistant, doing marketing, and thousands of other things that haven’t been invented yet.”

I take it as a general, this-tech-is-being-shoved-down-our-throats kind of way