As far as I know, a side light, seen directly head-on, (and tail lights) must be within a certain distance of the widest point of the vehicle's body. In total darkness with just the side lights on it's supposed to indicate the width of the vehicle body/frame.
Looking at that picture from
@Ianmc the 'side' lights are actually quite close to the centre of the car. Not much use at indicating the width of the vehicle in the dark. But maybe they're just within the distance.
Maybe face lift were just a gnat's doodah and/or wide body versions exceed the limit calling for side lights on the bumper.
Or something like that.