No, it's pretty widely recognized that WireGuard is in a sense a repudiation of "agility". You can look at, for instance, the INRIA analysis/proof paper to see how a bunch of disinterested cryptographers describe it: "many new secure channel protocols eschew standardisation in favour of a lean design that uses only modern
cryptography and supports minimal cryptographic agility."
If you want to say "minimalist agility is good and you're just saying maximalist agility is bad", that's fine, we're just bickering about terms. But that's pretty obviously not what Schneier is talking about.
