"...past work done by Nvidia..."
Now done for free by you.
"Of course, Nvidia's own compiler will extract best performance and value..."
"The memory model in C++ 11 ... C++ 17 ... C++ 20 ... C++ 23"
What do any of those have to do with the fact that Nvidia should be contributing this code to Vulcan and not trying to trick people into using their proprietary offerings?