EC-: This is a rather elementary observation (as I find it to be fairly obvious), but the two cleaners at the end represent the two developers. The entire game is an allegory of video games' allowance for mass pointless killing, similar to the idea behind
Spec Ops: The Line. Every answer you receive from them at the end can be interpreted as the developers speaking directly to the player. Is there any meaning behind it at all? Is that even the question you should really ask yourself?
I know what you mean by this, and this ending definitely seems to be the developers talking to the player. But, if you solve the puzzle, enter their computer and then talk to them, you actually get some proper answers from the two characters. These answers are definitely about the game's plot itself, not just the devs breaking the fouth wall.