Look at the engineering. Consult a tire expert at Goodyear.
They will probably say all their testing indicates a tire with a simple tread puncture that is properly plugged and patched will be absolutely reliable for USA highway speeds.
Now when you go from 70-80 mph (usa typical) to 140+ (Autobahn and track) you may have merely doubled the speed but you've probably done something like SQUARED the forces. (That's the rule, anyway, in sailing: double windspeed square the force of that wind).
My point: there's a world of difference between driving in the USA highways and driving at permissible autobahn speeds (180mph) therefore Porsche will NEVER recommend patching tires.
My bet is no GM or Ford manual (yeeech, ewwww) warns against repair of a tire has damage that CAN be repaired.