>>716500687
Most of that stuff has already been in the game, as narratives dripfed over years in lore drops and archaeology paper scraps and Dark Souls item descriptions. Rhinedottir finding Naberius' heart was in the game since 1.1 for example, a lot of the stuff is recontextualized later but it's always been there.
Except most casual players aren't lorefags and their eyes would go blank if you mentioned Gurabad, and the devs acknowledged it in the Nod Krai reveal trailer, so they split Snezhnaya into two years to spoonfeed lore directly to players that don't know it otherwise it'd make no sense.