If they want to run their relationship like a business that's OK, and to be honest I think it's good to read about people who are enjoying alternative ways of living when a 'normal' way doesn't suit them; it can help other people see that they can live how they want, even if other people see it as "strange, and horrible".
If writing it down is a way for them to communicate and negotiate openly, that sounds reasonable and healthy. From the joking clauses, it sounds more like a framework to ensure people have similar expectations and needs are addressed than some kind of binding document.
I don't find it particularly shocking that a tool meant for one kind of relationship with economic dimensions can be used as a template for a tool in another kind of relationship with economic dimensions.
Sounds like someone who never met a divorce/family law attorney. In California legally speaking part your relationship is treated as such.