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It may well be a simple way to add extra air to the centre of the rear vacuum caused by the truncated tail panel to assist smoothing the airflow in that region.
I suggest the benefit is a combination of adding air from under the car , tapering the sides (in a plan view) to do the same and finally allowing sone extra air from the roof section to make a contribution as well.
It may have a benefit well in excess of the obvious (reduction in frontal area and drag reduction) by helping the "wake" behind the vehicle to be minimised.
As technoshark mentioned...it is the details which matter.
Welcome from me as well by the way.
Cheers , Pete.
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