Metaethics sequence is a bit of a mess, but the point it made is important, and it doesn't seem like it's just some wierd opinion of Eliezer's.

Has it ever been demonstrated that there is a consensus on what point he was trying to make, and that he in fact demonstrated it?

He seems to make a conclusion, but I don't believe demonstrated it, and I never got the sense that he carried the day in the peanut gallery.