I feel like the descriptions of his clothing are the author making him a little funnier - nobody else gets clothing description.
That's not true. At the beginning he notices Bitcoin clothing further to the end he notices a Tesla jacket. He also speaks about his own Fermats theorem T-Shirt and how Eliezer reacts to it.
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.