“There’s a standard, but it’s performative” is a different argument than the top level one.
But even if we accept that, it doesn’t seem like a good comparative argument: anybody who has written a nontrivial amount of C or C++ has dealt with compiler-defined behavior or compiler language extensions. These would suggest that the C and C++ standards are “performative” in the same sense, but repeated claims about the virtues of standardization don’t seem compatible with accepting that.
But even if we accept that, it doesn’t seem like a good comparative argument: anybody who has written a nontrivial amount of C or C++ has dealt with compiler-defined behavior or compiler language extensions. These would suggest that the C and C++ standards are “performative” in the same sense, but repeated claims about the virtues of standardization don’t seem compatible with accepting that.