Say a site removed their forum. You can go to the site and view other things like articles. Even the link to forum is gone. So you google something and it comes up with one of the threads, even displays the text. You click on it and it takes you to 404 page not found. Where did google find the info and was still able to send you to the correct website even though the forum is gone. When I say gone. The website(magazine) still exist however the owner even wrote a message the forum has been removed on its homepage as a short article listed with usual news and what’s happening.