It documents that D'hara and Terran are not hostile to one another, in game-mechanic terms.
Neither were Caerywn and Astrum, until they were. I doubt anyone could honestly argue that they were not growing hostile to each other well before that federation was broken, however.
Particularly when it comes to federations, the game moniker is irrelevant to the true state of two realms' relationship. Because of the mandated war dec that happens when you break a federation, most realms won't attempt to adjust them to reflect the actual relationship between them and their federated partners if they start to drift apart since the consequences are highly awkward to deal with.
