No, it's a clickbait headline. That said, not many people dig in the preferences, especially the sick joke that is "System Settings", on top of which most people think "Accessibility" = "Disabled" which is just wrong, there is a ton of good stuff under "Accessibility" on the phone and computer. Also I don't remember it being mentioned in the Keynote, but it's been a minute.
Probably deserves a mention/article but "hidden" is a stretch.