A more analytical piece would have been more verbose and challenging. There isn't exactly a lack of verbose and challenging intros to rationality. This fills a gap.
I'm sure the author consciously picked the kinds of impressions that he believes would be most relevant to readers, were they to make his journey. So when he describes, say, Eliezer's body language, I suspect that body language really is remarkably odd (at least on first impressions), not that the author picked something small and idiosyncratic to remark on for no reason.
Where do you think that Eliezer's body language is described as remarkably odd? If you mean "He wore glasses, had a short, dark beard, and his heavy body seemed slightly alien to him.", I'm not sure.
It might be a reference to the way Eliezer talks about his body and ideas about cryonics that only the brain matters.
Cover title: “Power and paranoia in Silicon Valley”; article title: “Come with us if you want to live: Among the apocalyptic libertarians of Silicon Valley” (mirrors: 1, 2, 3), by Sam Frank; Harper’s Magazine, January 2015, pg26-36 (~8500 words). The beginning/ending are focused on Ethereum and Vitalik Buterin, so I'll excerpt the LW/MIRI/CFAR-focused middle:
Pointer thanks to /u/Vulture.