As soon as God is gone, the only standard to judge things is how well it suits you. You can dress a made-up morality in fancy philosophy; but it comes down to: "that's what the maker-upper fancies." There is no way to distinguish between your philosophy and Stalin's except in fanciness. But fanciness is a preference of the philosopher. Stalin preferred a more direct philosophy and there is no way to distinguish them.
Except for one thing. Stalin has a lot of guns. So his philosophy wins. And there's no reason to think it shoudn't because they are both made-up philosophies.
Stalin's postulates that his personal power is really, really important. Your's may postulate otherwise. But they are arbitrary and indistinguishable by any standard other than who has more guns and the will to impose.