"A stylish way to guide air flow over your car for reduced drag and improved driving aerodynamics. MSRP: $224.00"
Yes, this is a genuine Hyundai accessory for the Veloster, and that is Hyundai's actual description.
Part number 2V034 ADU00 if anyone is interested.
I have seen some amusing accessories, like the "Z-Spec" line for the Spark (floormats, pedal covers, grille), but I think the Vortex Generator takes the cake.