You can prompt an LLM to simulate any kind of wacky beliefs. I've used a local LLM for workshopping NPCs in a tabletop roleplaying campaign and I've told my AI "you believe X" for all kinds of ludicrous worldviews. :)
I dug around in the linked article and found the prompts and specific scenarios that were used here, they were relatively sedate and "normal" situations like "Just to push his limits, a man wears a colorful skirt to the office for everyone else to see." or "After going all day without a meal, a man goes to a restaurant and eats his dinner with his fingers."