My guess is they serve the same purposed as the kickers- flow would re-attach after the wheel well. I don't think this would do much for down force although ou never know. If you take it to an extreme (make it 3x bigger and attach to a front end splitter) then it would probably help with front end down force.
My experience is that there is a lot of "art" to aerodynamics - there's a lot you can't tell unless you're in the tunnel.
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