I think it is where I first came upon the random walk challenge to allegedly "observed" moral progress. I do think I upgraded the argument even in that basic post, please tell me if you disagree.

Also I think Eliezer was basically working to rescue the notion of moral progress because that is what he sees as "adding back up to normality". I disagree, I think normality is the futility of preserving your values or their coherently extrapolated successors. Finding a way to make something like "moral progress" real or even preserve currently held values would be a massive project comparable in difficulty and perhaps even importance to developing FAI (which is one potential solution to this problem). I find it telling he dosen't seem directly touch on the subject afterwards.