This is a weaker argument than the last one (which wasn't that strong to begin with). The only way Transhumanism's roots in Russian religion is relevant to evaluating it is if one suspects that modern Transhumanists share any of Fedorov's wrong beliefs. Other than Transhumanism itself, I mean, because assuming it's wrong is begging the question.
Federov's Rapture at Charlie's Diary
This is a follow-up to his article on Singularitarianism last week, which was also discussed here.
His own introduction:
I'm not sure if the point is really anything more than guilt-by-association, because he doesn't really make a complete argument for anything in particular.