I don't think that's the driver's fault. The pedestrian essentially darted out into traffic, not giving enough time for a human driver to react. However the autopilot, which presumably has a quicker response time, was able to react without driver intervention.
Now, had the pedestrian gone through a crosswalk and had there been roadsigns to notify the driver as such, but the driver was relying on autopilot and the pedestrian got hit? Driver's fault.
And yes, you can have it both ways here. Why? Because it is made pretty clear that autopilot is more of a convenience and in the right circumstances it can correct driver error (including errors made by other drivers and pedestrians,) but at the same time it is not intended to be a replacement for an actual driver, nor is it ever advertised as such. This means that ultimately you, the driver, are responsible for correcting the autopilot, but the autopilot is not responsible for correcting you.