If it was a simple flag, you would be correct a computer will react faster than any human but when you factor in everything else like constantly analysis of surroundings, decision making, and accounting for physical limitations, then yes. It's the reason why Waymo cars move so slowly.

If a person was standing at a sidewalk, hidden behind an object, far away from a pedestrian way or traffic signal and jumps 2 feet in front of a car going 25 mph, the average driver with their full faculties would do better than Waymo.