Ask yourself, what difference would you expect to see if Dr. Evil would disguise as Eliezer Yudkowsky? Why wouldn't he write the sequences, why wouldn't he claim to be implementing CEV?

Yes, it is impossible to distinguish a sincere optimist from a perfectly selfish sociopath. At least until they gain power (or move to an audience where the signalling game is played at a higher level of sophistication than that of conveying altruism).