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What are you talking about? Jason Donenfeld is the author of WireGuard, the extraordinarily popular VPN protocol that cannot use NIST cryptography (it does no negotiation, and is built on a version of Noise that uses ChaPoly and 25519). The change that was just described to you was a shift from NIST cryptography to non-NIST cryptography.

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> that cannot use NIST cryptography

Do you mean as a matter of Donenfeld's engineering decisions (that those algorithms are unavailable in WireGuard)?

Yes: they use, for lack of a better term, DJB cryptography, and like many modern cryptosystems they eschew negotiation, so it's not straightforward to fit NIST algorithms in.

it's entirely straight-forward to substitute AES-256-GCM for ChaCha20/Poly1305 in Wireguard, and the result, while not "wireguard" is substantially faster than Wireguard.

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