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I am quite sure that it is for RFI shielding, and that is as much black magic as science! Kind of like the old inside joke at NASA that Von Braun couldn't build a rocket without fins, rf ground straps are always braided and oversized ... just to be sure! There is logic behind the use of braid ... it increases surface area, and rf energy always travels on the outside of conductors, and 16, 14, or even 12 gauge copper wires don't have much surface area! But, a nice 10 mm wide piece of braid does!
So, just like the fins on a Saturn V booster, Porsche lids get grounding braids, even if it might be overkill, from an engineering standpoint!
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Warren Hall
1973 911S Targa
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