It has a meta punchline, in this case breaking the “rules” of this joke setup / structure and subverting expectations.

I don't see it. The only thing that was subverted was the expectation that your setup was truthful when it was in fact a lie. But that's just lying. Also the "punchline" is just the obvious answer once you move past the lie. So I'd say it has no punchline, which makes it an anti-joke.

Edit: OOH you’re the guy who just told me to go to hell lol

Well, that's entirely on you. One doesn't just causally dislike LotR.