Sorting Pebbles Into Correct Heaps notes that 'right' is the same sort of thing as 'prime' - it refers to a particular abstraction that is independent of anyone's say-so.

Though Eliezer is also a sort of moral subjectivist; if we were built differently, we would be using the word 'right' to refer to a different abstraction.

Really, this is just shoehorning Eliezer's views into philosophical debates that he isn't involved in.