Given that AI is core to Tesla's robotic and self driving future, it seems like theres a lot more to this story than what has been leaked thus far.
Tesla robotic future ? They are years behind competitors... they are very good at faking autonomous robots though - people are still falling for their Twitter posts, Robotaxi unveil with teleoperated robots and Tesla Diner teleoperated robot serving popcorn (which last something like 2 days... then it was gone already). It's all PR stuff, nothing is really happening behind the scenes.
Merging together the technological paths of autonomous behavior of a robot and all the little actuators, power supplies and sensors suites does not seem like a big leap either. Challenging but not fantasy.
Part of Elon's process is demonstrating the potential need / business case, while also testing implementation in real world, high stakes environments. A bartender/service roll is a fun place to test since they can deliver a service in a public setting, potentially tethered to the wall.
Yes it is fantasy. This is the same thing like showing a mockup and saying - okay, that's it, now we 'just' need to implement and make it work.
FSD as an ADAS system is fantastic. But it's nowhere near a fully autonomous driving.