Usually utilitarianism means maximize the utility of all people/agents/beings of moral worth (average or sum depending on the flavor of utilitarianism). Eliezer's metaethics says only maximize your own utility. There is a clear distinction.
Indeed, but I'd like to point out that this is not an answer about what to do or what's good and bad, merely the rejection of a commonly claimed (but incorrect) statement about what structure such an answer should have.
I think think I disagree, but I'm not sure I understand. Care to explain further?
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.