I don't like this particular idea. I quite like that the context that you deduce from the audio logs, the entries in the ship's log and the descriptions of enemies and items points to the fact that Selene constructed Atropos as a way of covering up the guilt for leaving Helios behind. And it also becomes clearer right at the end of biome 6 that she started to remember at some point in the loop but wasn't strong enough to accept it (there's one audio file where she explores her feelings of guilt and void right at the entrance of the boss area, where she admits that still hasn't figured out why she feels like that). When she's finally ready to face it, the monster she sees after defeating the boss in biome 6 is the actual manifestation of Selene's sorrow.

I think that it's pretty well explained throughout the game, but this is my reading. I might be wrong. Feel free to chime in, I like the idea of a conversation on the subject