You certainly don't have to buy it, that's true.
But when you ask a question and someone provides an answer you don't like, showing why that answer is wrong can sometimes be more effective than simply asserting that you don't buy it.
The problem is a kind of quodlibet. Any inadequate theory can be made to work if one is allowed to dismiss whatever the theory can't explain.
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: