So what's the difference between this and mentioning in the future fusion drives will run your car and provide unlimited energy for a lifetime.
To be clear, Tesla is representing that a car you can buy today will one day drive itself. It would be very hard to represent that a car sold today will someday magically develop fusion capabilities. Again, I don’t happen to believe that current Tesla models will achieve what is stated in the marketing copy.
That's still more than they could say for fusion drives, but it doesn't imply they will ever provide you with any self-driving software. Just that they believe it's possible to write such software.
Put another way, there are a lot of people who are going to be really pissed when they realize that their car will never do those things, and they paid $10k for practically nothing (ok, technically they get autopilot and the ability for the car to stop at red lights today).
I think this bit is meant to cover their rear: "The future use of these features without supervision is dependent on achieving reliability far in excess of human drivers as demonstrated by billions of miles of experience, as well as regulatory approval, which may take longer in some jurisdictions."
Translation: we don't/can't actually guarantee this will ever happen, and if it does, it may depend on where you're located.