That said, other cars, with more types of sensors, would probably have “seen” the obstruction on the road.

Well yeah, that’s sort of the entire point of the video. He ran the test with a lidar-equipped vehicle, and it saw the wall right away. Hell, a radar-equipped car (like early teslas) probably would have seen the “kid” behind the wall as well. But since Musk has decided that cars should be able to self-drive with only cameras, the newer teslas will just plow straight into the wall without braking.

Yeah, pulling radar from the cars was the beginning of the end. Early teslas had radar, and that was what led to all of the “car sees something three vehicles ahead and brakes to avoid a pileup that hasn’t even started yet” type of collision avoidance videos. First, pulling radar was a cost cutting thing. Then Elon demanded that they pull out the lidar too, and that’s when their crash numbers skyrocketed.