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I honestly cannot see what optimising a wing to provide maximum lift/drag ratio for an aircraft flying in ground effect has to do with the shapes of cars.
But I can see several reasons why it wouldn't be useful, and in fact could be quite deceptive.
From the paper:
...two optimization objectives are considered—maximization of the lift coefficient and the lift to drag ratio. - Neither is the aim with car aerodynamics.
The airfoil shape that results in lowest value of 100 x Cd/Cl... gives the shape of the optimized airfoil. - So, as you'd expect, they are chasing maximum lift and minimum drag. We don't want maximum lift in a car!
If the paper was about the best shape, in proximity to the ground, for lowest drag and lowest lift, I'd be all ears. (But even then, of course, they'd need to replicate the relatively rough surface of a car versus the dead smooth surface of an airfoil.)
I guess if you want your car to fly with the least power being consumed, this looks like an ideal paper to read!
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