This is more of a website issue.
As part of the October 2014 redesign, most of the original content on the 3D Realms website were moved to the legacy.3drealms.com domain. However, the new website does not point users to the updated URLs, and this has created lots of broken links as a result. For example, the original game catalog at
http://3drealms.com/games.html now dumps the user back to the home page or returns a 404 error, depending on whether or not the "www" prefix is present. This can be easily resolved by creating HTTP 302 redirects to the legacy.3drealms.com domain. As a matter of fact, the W3C strongly suggests the use of
static URIs when possible to prevent link rot.