It depends what the "full self driving" feature is legally. How it is described, what the warning messages on the screen tell the driver, what the manual says.
If the person was a Tesla employee I think it's safe to assume that they knew it is only an assistant system and the driver still needs to monitor it at all time and able to take over at any time.
Hints into this direction pop up at the screen all the time. This could become more vague if once a driver gets into this situation that is illiterate or doesn't speak the language the car is set up to and genuinely misses all of that.
Anchoring and peer pressure are strong psychological biases. Public opinion and the opinions of a not-so-smart driver are very relevant when it comes to design for safety.
If the person was a Tesla employee I think it's safe to assume that they knew it is only an assistant system and the driver still needs to monitor it at all time and able to take over at any time.
Hints into this direction pop up at the screen all the time. This could become more vague if once a driver gets into this situation that is illiterate or doesn't speak the language the car is set up to and genuinely misses all of that.