I have no horses in this race and lack the expertise to judge, but this is part of a larger fight and djb seems to be on the other side of a lot of good cryptographers:
https://mailarchive.ietf.org/arch/msg/tls/ZBpcicZX1Dxnam2gMa...
https://mailarchive.ietf.org/arch/msg/tls/ZBpcicZX1Dxnam2gMa...
The person you linked to works for Google, which he seems to omit mentioning in the mail you linked to.