There’s literally no way this makes sense as a statement. Either Ken is stating that it’s important that you understand that just because you run the game doesn’t mean you literally control the minds of your players;
Or Ken is dismissing every role-playing game that has supernatural elements that influence the mind (everything from Charm Person to basic telepathy), or mechanics that allow for the Game Master to write parts of the backstory and/or lead to trauma. That’s basically every table top role-playing game with combat.
Source: Ken Whitman (as Whit Whiman) & Google NotebookLM The Whitman Method: Episode 2: Mastering The Essential Session Zero (17 April 2026) Whit Whitman (@whitwhitman) YouTube <www.youtube.com>, at 1:57