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I have seen this using smoke with my wind tunnel models; at high speeds there is only a small area in front of the cooling inlet opening where the smoke will actually go in. So at high vehicle speeds, most of the airflow in the vicinity of the frontal inlet is actually "spilled" outside the opening.
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so would it be correct to say that any grill will take in less air as speed increases, and more air goes over the car?
i found two more interesting grills seen on older citroen and peugot models from the 80 and early 90's
both seem to have blocks in place the the airfloils... given the the area between the blocks is equal to the frontal surface of the blocks... to me it seems these might behave similar
citroen AX
peugeot 205