This strikes meas a difficult thing to know.
There are a large number of possible motives that could lead to assuming that the people in question are simply wrong. None of them are particularly pleasant (but not all of them are unpleasant). I don't need to know which motivates them in order to make the statement I made. However, the statement as paraphrased by TheOtherDave is much more specific; hence the difficulty.
As a more general comment, I strongly approve of people kicking tires, even if they're mine. When I see someone who doesn't have similar feelings, I can't help but wonder why. Like with my earlier comment, not all the reasons are unpleasant. But some are.
Taken from some old comments of mine that never did get a satisfactory answer.
1) One of the justifications for CEV was that extrapolating from an American in the 21st century and from Archimedes of Syracuse should give similar results. This seems to assume that change in human values over time is mostly "progress" rather than drift. Do we have any evidence for that, except saying that our modern values are "good" according to themselves, so whatever historical process led to them must have been "progress"?
2) How can anyone sincerely want to build an AI that fulfills anything except their own current, personal volition? If Eliezer wants the the AI to look at humanity and infer its best wishes for the future, why can't he task it with looking at himself and inferring his best idea to fulfill humanity's wishes? Why must this particular thing be spelled out in a document like CEV and not left to the mysterious magic of "intelligence", and what other such things are there?