You know, I'm tired of dancing around the "buts" and "maybes" and "what ifs". Let's just call it as it is: Porsche and Audi are willingly frying their cells, because most people won't fast charge that often and they can afford to eat the warranty costs on those who do.
There is no other explanation that meets Occam's Razor. There is no magic cell that somehow only they have that nobody else has heard of, that manages to be simultaneously energy dense and power dense. Their cooling design is primitive. They're not "locking out" half of the pack to make the C-rate appear faster than it is.
Let's call a spade a spade: they're frying their cells.