While reviewing another SSE question that linked to this KB page, I noticed in the top-right corner of the page's main content section that there was a little icon labeled "hidden article". What exactly does this mean? Does this article simply not display in search results? Is there a known reason for making an article hidden (e.g. the article isn't complete yet, etc.)?
The label is indeed for unlisted articles (articles that are accessible, but only if you have the link). We sometimes use it for soft launches if it doesn't matter too much that the info is discovered.
That particular article shouldn't be hidden; PSS (Product Support Services) are fixing that now.
The fact that logged-in users can see it and anonymous users can't is a bug and has been reported.
Thank you for raising it!