The title is just poking fun at the "The Universe is a Simulation" articles that keep popping up, I mean sure it technically makes an irrelevant claim, but in context it's clear that the main part of the article is supposed to be about how we can simulate the universe.

I agree it's kind of weird to raise something in the title and not address it at all in the main article, but that's a minor flaw in what's clearly intended as a joke.