Sure, we can posit that God doesn't allow certain behaviours, or promotes others, by handing out rewards or punishments or by controlling the universe's evolution (as in panentheism). Either way, that's an appeal to God's power, not to what's morally right. Obviously, a divine creator would have the power to shape his or her creation.

In any case, the point you quoted is narrower. The question there was whether God has an explicable nature. Are you saying the natural universe is God's nature, and that that nature is good because it's steered in a moral direction?

I think the problem with that is that life and morality seem like exceptions, not the rules of nature. The universe is mostly amoral, in so far as it's physical. Maybe this will change billions of years from now, but that's a big leap.