Please tell me it wasn't Hyrum himself who made an observation that many people have made over time (even citing some of them), then called it a "law", named it after himself, and bought the domain name for it.
EDIT: Upon re-reading it, I'm seeing that Hyrum gave this Titus Winters guy (who I've never heard of), also at Google, credit for giving credit to him. ...what an impressive density of greatness over there.
I'm not implying anything about Titus, I'm implying something about Hyrum. Apparently he must have thought to himself: "Well, I'm still missing a name drop here for my credit-grabbing." If that name had been "Niklaus Wirth" or whatever, and it was Niklaus Wirth who put up the website, then, sure.
...but the best name he could come up with is a name only recognized by fellow Googlers and people attending highly specialist conferences, and he's going around telling people "Hey look, this super-smart thing that I once said. It's so cool. Look, this guy over here also thinks that I'm the one who deserves credit for it. This is so smart, it will blow your mind. Now listen up, ..."
If this kind of thing doesn't "pop" to you as a violation of social norms then you know you're living in a subpopulation where, basically, narcissism has gone endemic.
I think you are extrapolating a bit much from an almost in-joke in a community you aren't part of. Domains are cheap, putting up a website about something doesn't mean much.
I met the eponymous Hyrum; went to lunch with him on a social occasion that had nothing to do with software. He is a very nice guy and quite humble, in fact. Thoroughly good chap.
I too see the page as a bit pretentious, but life is so short and this small quantity hubris isn't going to lead to the starvation of orphans. Let people deploy some arrogance.
Most HN users do more damage to the world through their adtech careers than any blog post.
EDIT: Upon re-reading it, I'm seeing that Hyrum gave this Titus Winters guy (who I've never heard of), also at Google, credit for giving credit to him. ...what an impressive density of greatness over there.