Anons,
How did the Anon retrieve this data dump (See image).
Very familiar with SEO Backlink technologies that can give an Anon the power to get an idea of what is behind a closed end, password protected site by looking at the "digital dust" that it leaves behind.
Anon,
Two servers in two different continents both are secured. One site wants to have a presence on the other secure site but gets a little lazy. Thus instead of re-creating its text/image organically on the other secure site, the lazy individual will just to go to the other site and upload a link to the other secure site. Both sites are secured, however, the link between the two sites is WIDE open and can be seen by all with even basic SEO technology solutions (old 90s technology).
Thus, if you are trafficking (fill in the blank) on the edge of the web, you think you are secured, however, YOU ARE NOT as your link solutions' (backlinks, anchor links, etc) text elements are FULLY EXPOSED to the entire world. What text elements, you say? Maybe prostitution, drugs, etc.
Or,
If you are a journalist writing an article and you want to see how it looks on an unindex web skin that only can be assessed if you have the specific URL. Backlinks could help you find the created page and it can be f ool allowed while the different webskin versions are written and manipulated.
Simpler than that.
Just search for SEO backlinks on the web.
Quite a few will show up (i.e. ahrefs, etc).
Type in a main URL address like whitehouse.org and you can see all the sub-domain websites associated with the main website address even though they are not searchable through a regular search engine.
What gets really suspicious is if u see a small company that has more traffic than General Motors website and a few sub-domains that have RESTRICTED ACCESS or FORBIDDEN ACCESS message when you try to assess it.
Cannot access it however if anyone behind that wall posted a link on another secured sub-domain site, one could see the text elements responsive to it by way of the backlinks technology layer that they utilized.
And they could possibly see this with SEO Backlink technology solutions.