Those codes for the 3 vault symbols inside the dream/simulation world. I've found the room that has the codes but they're burned out, if that helps
What new skills have you developed or tricks discovered in order for you to explore this new virtual world?
I found out that if I drop the artifact in the dream world and move away from it the world turns all pixelated
Thats all i can say really without spoilers so if you cant figure it out with that then that means youve probably missed some stuff around the map