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There is an extension called HN Friends that allows to add information to a tooltip for users and shows a hint that there exists such information.

Use this as you like.

You've edited the response since you posted it. I think there's a difference between diction and the standard output of ChatGPT et al.

I have trouble believing that you're pointing this out in good faith.

You could create a browser user script to do it locally.

That's not a terrible idea.

An extra UI element or two should be enough. Maybe with sticky options for collapse-by-default or hide-by-default at the top of each HN comment section.

And the list of usernames can be stored and edited in the purveyor's HN bio (in plain text, like a monster), so that it works automatically across devices.