A human could not see the person until it was too late, but shouldn’t the sensors on the car have noticed?
Looking at a video to guess if a human could have seen her or not does not make sense. Most eyes are vastly superior to this dash-cam.
As for the car, I agree, this was about as basic, trivial test as it gets. Open road, low light conditions (where many sensors shine) and she is walking normal speed.
This was really an opportunity for an autonomous car to shine. I actually expect that a Tesla collision detection system would have picked this up and braked (although I'm not 100% how it works on humans vs cars).