And none of this is really relevant because it's TFA that should determine HN titles. But for better or worse the mod has made his decision, so this is moot -- I won't comment on it further.
And man, for someone who calls something "nitpicking" to dig so deep into it ...
https://en.wikipedia.org/wiki/Vint_Cerf
> Widely known as one of the “Fathers of the Internet,
https://www.internethalloffame.org/vint-cerf/
> Together with Vint Cerf, Kahn is known as "the father of the Internet." https://computerhistory.org/profile/robert-kahn/
So much for "but no one ever calls him father of the Internet."
It’s widely recognized that the internet has multiple fathers.