In Eliezer's metaethics, all disagreement are from misunderstanding. A paperclip maximizer agrees about what is right, it just has no reason to act correctly.
To whoever voted the parent down, this is edit nearly /edit exactly correct. A paperclip maximizer could, in principle, agree about what is right. It doesn't have to, I mean a paperclip maximizer could be stupid, but assuming it's intelligent enough, it could discover what is moral. But a paperclip maximizer doesn't care about what is right, it only cares about paperclips, so it will continue maximizing paperclips and only worry about what is "right" when doing so helps it create more paperclips. Right is a specific set of terminal values that the paperclip maximizer DOESN"T have. On the other hand you, being human, do have those terminal values on EY's metaethics.
In You Provably Can't Trust Yourself, Eliezer tried to figured out why his audience didn't understand his meta-ethics sequence even after they had followed him through philosophy of language and quantum physics. Meta-ethics is my specialty, and I can't figure out what Eliezer's meta-ethical position is. And at least at this point, professionals like Robin Hanson and Toby Ord couldn't figure it out, either.
Part of the problem is that because Eliezer has gotten little value from professional philosophy, he writes about morality in a highly idiosyncratic way, using terms that would require reading hundreds of posts to understand. I might understand Eliezer's meta-ethics better if he would just cough up his positions on standard meta-ethical debates like cognitivism, motivation, the sources of normativity, moral epistemology, and so on. Nick Beckstead recently told me he thinks Eliezer's meta-ethical views are similar to those of Michael Smith, but I'm not seeing it.
If you think you can help me (and others) understand Eliezer's meta-ethical theory, please leave a comment!
Update: This comment by Richard Chappell made sense of Eliezer's meta-ethics for me.