Yes? But the recipient of an "argument" is implicitly an agent who at least partially understands epistemology. There is not much point in talking about agents which aren't rational or at least partly-bounded-rational-ish. Completely insensible things are better modeled as objects, not agents, and you can't argue with an object.
There seems to be a widespread impression that the metaethics sequence was not very successful as an explanation of Eliezer Yudkowsky's views. It even says so on the wiki. And frankly, I'm puzzled by this... hence the "apparently" in this post's title. When I read the metaethics sequence, it seemed to make perfect sense to me. I can think of a couple things that may have made me different from the average OB/LW reader in this regard: