Interestingly, the actual source (at least in a similar tweet[0]) was a fracking company[1] who seems to have an automated system filling their blog's "Industry Perspectives" section by republishing random articles that sound sort of geology related, for SEO. They even link back directly to the Onion!

[0] https://x.com/oneunderscore__/status/1793779462968099202

[1] https://www.resfrac.com/blog/geologists-recommend-eating-lea...

Then how would you ask it questions about the onion?

Q: "What was that joke about xyz?"

A: "It was from an article on the Onion ...."

So smart they lack common sense - what a dilemma

it will be a constant game of whack-a-mole, there are many other satire/parody sites and new ones could pop up every day