[aerohead]

I looked at the article, then the Kia/Hyundai original content, with video and simulated flow.
Some quanta:
1) for the Genesis GV60, we're told that the AAS is good for delta Cd 0.008
2) we're told that this constitutes a 2.8% drag reduction when deployed.
3) dividing 0.008, by 2.8% ( 0.028) = Cd 0.2857 for the un-deployed AAS car
4) subtracting the delta-Cd 0.008 yields Cd 0.2777 ( a smidgeon lower than the McLaren Speedtail )
5) Sun Hyung Cho does not specify whether he is referring to Cd, or CdA.
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6) From observing the GV60 materials we 'know' that the GV60 has 'two' different frontal areas which are unaccounted for.
7) without the Cd/CdA data, we're left with un-actionable information, exactly as Ford Motor Company did a few years ago with their SAE Paper on the F-150 airdam/Cd investigation which Vman455 shared with us.