God hasn't commanded, allowed or written that he is good, he simply is supremely good. Morality is judged against the best model. As we've already defined what is supremely good, then we can have a benchmark for ultimate morality.
Morality was never an attribute of God. As an ultimately perfect being we can deduce that he would be ultimately moral.
Morality was never an attribute of God. As an ultimately perfect being we can deduce that he would be ultimately moral.