The part to remember from that quote is: "is an external aero appearance related piece." I'm sure being a big mfg, they do have access to a wind tunnel, but I really doubt the S-tune bits add significant downforce, just looking at them. The "diffuser" in particular isn't really a diffuser, and the "downforce" part of their claims could easily be referring to just the rear spoiler, not the front end stuff.
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