As the Discourse policy (not the one you were first linked) says, if the project was substantially LLM-generated, then yes. (‘Substantially’ is left up to your judgment. If you used a Copilot autocomplete a few times, I wouldn’t worry about it.)
(This is largely to prevent the first six posts on the topic from being people fighting over it! You and I both want these announcement threads to be primarily productive discussion of the tool — feedback that you will find useful and observations that other community members will want to see. Prompt disclosure lets the anti-LLM people nope out quickly instead of starting (what I’m sure feels like) an inquisition.)