To be fair, it's not a computer performance benchmark being gamed here. If nightime is problematic, autopilot shouldn't be running at night. Because if I'm a pedestrian then the odds are stacked against me with any physical encounter with a vehicle. Fairness in the scenario setup shouldn't really be part of the conversation unless it goes beyond the claims if the manufacturer, i.e., if Tesla had said "autopilot does not function in these conditions and should not be used at those times" and then "nightime" was one of those conditions listed. If Tesla hasn't said that a scenario is outside the scope of AutoPilot then the scenario is an appropriate test & comparison point.