Note that these were all minor NPC factions. The banner of Schwartzhafen, a removed Vampire Counts faction. While the removal of a generic lord such as Rinki in favor of adding an actual established Warhammer lore character probably does not bother many at all, this page still exists as a form of documentation of what has been taken out of the game over the years. In the Mortal Empires map, the faction of Xlanhuapec got replaced by the new Cult of Sotek. An example of this is when Doomsayers Update released with The Prophet and the Warlock DLC. This can result in the new faction taking the location of an old one, replacing it.
In most of the cases the content comes in form of new Lords and new Factions.