To whoever voted the parent down, this is exactly correct.
I was the second to vote down the grandparent. It is not exactly correct. In particular it claims "all disagreement" and "a paperclip maximiser agrees", not "could in principle agree".
While the comment could perhaps be salvaged with some tweaks, as it stands it is not correct and would just serve to further obfuscate what some people find confusing as it is.
I concede that I was implicitly assuming that all agents have access to the same information. Other than that, I can think of no source of disagreements apart from misunderstanding. I also meant that if paperclip maximizer attempted to find out what is right and did not make any mistakes, it would arrive at the same answer as a human, though there is not necessarily any reason for it to try in the first place. I do not think that these distinctions were nonobvious, but this may be overconfidence on my part.
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.