"Facebook is its Users. No amount of AI can sell advertising the way Users can. And, last time I checked, it's still the User clicking around and having experiences."

I think you might be over reacting to this language, I believe the intent of the original article was to say that "the current Facebook USER EXPERIENCE cannot exist without AI" - clearly there are other things (users, user engagement) that make up integral parts of Facebook. No one is saying the product is AI.