my dumb car "works" for self driving assuming a straight enough road without obstacles. A safety critical system needs to have a very robust definition of "works" that is far beyond "it happened to not crash on this particular road at this particular time with this particular set of obstacles".

Fair enough; my "not at all" was hyperbole, Tesla's driver assistance software does not in fact crash every single time it is used without human intervention.

I do find it mildly disturbing that in that video, the driver points out the car making fully blind turns where it cannot see that there's nothing it would hit.

Did I miss the dirt road part? That looks like it starts on a rural but paved road, and ends in a town.