By "Then we can confidently say" I just meant "Assuming we accept the above analysis of morality, then we can confidently say…". I am not sure I accept it myself; I proposed it as a way one could believe that normative questions have objective answers without straying as far form the general LW worldview as being a Roman Catholic.

By the way, the metaethical analysis I outlined does not require that people think consciously of something like CEV whenever they use the word "good". It is a proposed explication in the Carnapian sense of the folk concept of "good" in the same way that, say, VNM utility theory is an explication of "rational".