If you calculate ELO based on a round-robin tournament with all participants starting out on the same score, then the resulting ratings should simply correspond to the win count. I guess the algorithm in use take into account the order of the matches, but taking order into account is only meaningful when competitors are expected to develop significantly, otherwise it is just added noise, so we never want to do so in competitions between bots.

I also can't help but notice that the competition is exactly one match short, for some reason exactly one of the 561 possible pairings has not been included.