Miyazaki and FROM have a pretty good idea of what and who constitutes the worlds they build. Lore descriptions are not randomly thrown out there. There's a consistency that wouldn't exist if that was the case. I know this from playing the games myself, and from reading various interviews with Miyazaki over the years. I wouldn't be able to find most of them now, but here's a snippet from an interview I do know how to find, talking about Big Hat Logan:
"Miyazaki: I suppose it wasn't. As to why I made him naked, I wanted to show that the character had found enlightenment but unfortunately the models in Dark Souls weren't built with a wide range of emotional expressions, so as I was thinking about how to overcome this problem, for some reason, I came up with the idea of making him naked…
It's Logan's goal to gain the power of the ancient dragons, so in order to do this, I had an image of him casting off his human clothes. It's similar to using the Dragon Head or Torso Stone, you have to remove your equipment. Of course there are gameplay reasons for this too, but there was also this image of the player leaving something of their humanity behind. Similarly, Logan removing his clothes is his attempt to bring himself closer to Seath in some way. Although I couldn't take his hat off because no one would recognise him, but personally I like to think that unlike the followers of the path of the Dragon, Logan sought to gain the dragons power while retaining his pride as a human."
The interview is largely about character/monster designs, but there's still a lot of good stuff in there that shows the thought process behind the games.
https://darksouls.wiki.fextralife.com/Dark+Souls+1+-+Design+Works+Interview