Yes @elonmusk has stated that Autopilot can not be engaged w/o land line. Even if you were able to engage it or adaptive cruise control, once that seatbelt is unbuckled, IT WILL STOP THE VEHICLE. https://twitter.com/WSJ/status/1383835010021556227

It will not stop beeping until you step on the brakes. And still automatically slows down and come to a complete stop with hazards on.

I lifted my butt up “ driverless” it still came to a COMPLETE STOP .
Thanks @elonmusk and @Tesla for making AutoPilot safe! FSD will save many lives for sure.

You CANT FOOL AUTOPILOT, but you can fool yourself.

@klwtts also made a video about this too

The last few videos testing AP was on the Model Y with FSD HW3

Model X with FSD HW3.0. No line, No Autopilot only TACC

When I lift my butt up, it goes into park