Yep that is post C++20.

I am hardly a C++ user nowadays, but such stuff interests me, because the Windows Development team managed to push C++/WinRT as replacement for C++/CX, but are declining any improvement to Visual Studio support (at least comparable to C++/CX) until ISO C++ gets similar capabilities to C++/CX.

So given that some C++ usage is required depending on which APIs you want to access from .NET, you can imagine there are many WinDevs not very happy with the downgrade in tooling support.

Back to your point, in what cases might such distinction be relevant?