Tesla vehicles cannot operate fully autonomous as-of now. Tesla has no idea if they'll need to replace or upgrade hardware either. They simply have not solved the problem yet, but want everyone to buy into the hype. And, the hype machine is working, unfortunately.
I love my car but the FSD debacle is embarassing. A lot of people are finding out that they'll never get anywhere near $8K value from their pre-purchase, and they bought a license that expires when they sell the car. I expect a class action lawsuit eventually (I'm surprised it hasn't happened already).
They have upgraded the hardware 3 times already.
Maybe the hardware in the last generation of Tesla's suffices, but right now, nobody knows.
But I have to admit, marketing wise he is a genius.