Well it kinda does. I mean the topic is the Long Game and since the Chaos Gods can't loose they must eventually win, right? The Gods can't ever die, everything else in the contest can and probably will so all they have to do is wait.
No, this isn't the case at all. The c'tan can't die either remember? Yet both sides aim to enslave and feed upon all life. The question was who wins the lasting victory in the Materium. Immortal or not, the influence of both these classes of gods can be contained one way or another, so neither is necessarily guaranteed victory.