And before you say that's insane... You'll find plenty of video evidence on Youtube and places like it that this happens. In fact, McLaren sent a car themselves.
And yes, the Nullarbor can be very dangerous if you break down, and there are vast swathes of it with no phone signal, because maintaining anything out there is a losing battle.
Well, by the very definition, there can't be that many people there - so unfortunately they will have to buy something else, or discuss it with their dealership before they purchase the car. When I got my current car(2020 Volvo XC60) the dealership did warn me that if I don't have signal many features in the vehicle won't be available(no idea if it would "brick" itself if I tried repairing it in the middle of a desert, but I'm not interested in finding out).