This article applies to the subset of ChatGPT chats which were shared and opted into to make them visible to web crawlers. 404ing these chats would break the feature.
The problem is simply accurately messaging to the user who is opting to share it.
Feels like they could just change the URL to the chat when you disable the discoverable thing. Guess that’d break links you explicitly shared, but who’s going and referencing someone else’s ChatGPT search so often they can’t take a updated link?