it seems like it's taken you four posts to say "Philosophers are confused about meta-ethics, often because they spend a lot of time disputing defintions."

No, he said quite a lot more. E.g. why philosophers do that, why it is a bad thing, and what to do about it if we don't want to fall into the same trap. This is all neccessary ground work for his final argument.

If the state of metaethics were such that most people would already agree on these fundamentals then you would have a point, but lukeprog's premise is that it's not.