Those are all speculative theories based on level design. I wouldn’t say they count as proper stories because there is no narrative exposition, not even one implied through level design.
Regarding Mechaenetia, I think you are saying the player will have no backstory but the game universe itself will have a procedurally generated backstory like Dwarf Fortress. Mechaenetia will not have a story narrative in the mold of Factorio, No Man’s Sky, Starbound, etc.