These types of posts are .. well thought-out, and usually posted by someone with relevant education. But they are not reviewed documents or journal articles, and you can _tell_ when someone is mixing in a lot of their own educated guessing with the research they've done. Which is the case here.

He probably wasn't intending it to be taken as authoritative source, but that's how most people will _read_ something like this after running into it on the front page of HN. And most of this is just.. guesswork.