I said this in another comment, but an AI blog author is never going to reveal their 'source' that way. Mostly because it'd be a rubbish prompt or one that is loaded with a predetermined conclusion.

I think you have to take the output as read and decide accordingly. If it looks like low effort AI writing then it's not much better than spam.

I think the the top-voted post being all about the provenance of the article says something about where HN's voting mentality lies - we are not prioritising the substance of the post but how it was produced.