So, I bought this phone based on your reply. Silly me, I really should’ve read around more. That’s for game mode only, at least in the current software (nothing OS 2.0.0, Android 13).
Edit: I noticed your screenshot is of the lock screen. I can’t get this to appear for myself, but it does seem not to use the fingerprint reader if the top is covered, and I don’t press the lock button. But, if I press the lock button, I can unlock the screen just fine with the top covered. I can’t get any message like that to show up though, I assume that’s what the mistouch prevention setting in game mode looks like.