I found this too and posted it about 20 pages back. I too was really excitedbut I don't think it has anything to do with the Guardians.
A slim possibility of a hint at a earthlings-guardians and Moon theory mayhaps? Just speculating, but I think we should never forget, that ED is just a game and its puzzles were made by human for humans to solve, even more, by players, and whilke there are many bright and fine among us, I dont think those puzzles require a cadre of specialists with various scientific degrees to be solvable, so simple solutions should not be overlooked.