"Full Self-Driving capability is now available" [..] "and do not make the vehicle autonomous."
We truly live in a world where facts are vastly inferior to marketing. Highway cruise control, lane changing, traffic light stop and assisted parking has been around long enough that you can get it in a $5k used car already. I'm surprised that they don't have a speed limit and sign detection, because that, too, has been around for a long time. So in effect, this is a "get feature parity with a cheap used car" upgrade. But nobody cares and the stock price rises anyway.
In a way, Donald Trump, Elon Musk, and Steve Jobs are quite similar. They perfected the reality distortion field and at least some people absolutely love them for it.