The "developer's intended way" of Dark Souls story is actually good but lore autists make it all gay instead. You're not supposed to have access to literally everything in a single playthrough or read bullshit online by people make six figures shilling videos. You're supposed to see an environment, fight its boss(es), pick up a few items, maybe get a singular rare drop per area, and then turn the boss soul into a piece of the lore of King Fucktard or Knight Faggot. So you get a few little pieces in design and item descriptions on top of anything directly said and you sort of make sense of it in your head. You mostly write the story based off of how you played. It's neat and simple that gets fucked five ways by people insisting there be something more than that. The story to the games is NES tier "world sucks and here's a two sentence framing of your actions" that gameplay is supposed to fill in for.
All the contradictory shit and things lost to development isn't some massive planned anything. It just doesn't matter to the game itself or the story you're supposed to make up anyways.