Chase vehicle.
In any case, the promise was full coast to coast self driving by 2016. Not a limited run of some automatic taxis (mostly for publicity) that only operates with safety drivers or safety chase vehicles by 2026 in only one city.
Finally, we've gone from talking about top level AIs chips (Dojo) to limited run safety driver based taxis. It's really astonishing how far you are moving the goalposts here looking for a win.
You know that Elon Musks primary AI effort is xAI, which has failed so hard it's being rescued by SpaceX right? There's like the actual AI effort we can talk about here.