I think they just say they know to save face. Even if they do eventually their brain is going to rot to the point where they can't tell. It all looks soooo creepy to me I can't stand it. Folks were telling me to use AI to read my reports because "you can't tell" like good lord yes you can and it's creepy as fuck!
These are exactly the types of people who would get gobbled up by mimics deep in the mountains. There's a reason we evolved to have an uncanny valley IYKYK