but describing an entire nonexistent init system without some kind of directive in that direction?

Someone else, i.e. the user called “notabot”, had already made the following interesting observations:

• rye is software that actually exists and is found within the repos
• rye is written in rust
• rye has an init command; rye init

I don’t think it’s too far-fetched to think that an LLM is aware of the above. But, it failed to understand what rye actually is and how its init command isn’t competing with systemd.