They're manually adding this data.
I will take a gander however and assume someone didn't like what was presumably a rhetorical and pretentious response.
I do though agree. As to your first response, a quick right click will show that the site is made with Wordpress. The lack of formatting for the stack grids suggests it MAY be a plugin from which this is being retrieved; nevertheless with the choice of Wordpress, I am doubtful.
Perhaps I don't understand the hn culture, is suggesting ways to do something more efficiently against the rules of Show HN? And if whoever keeps downvoting me wants to discourage me from making similar comments, how about explaining what is wrong with my comment? Instead of anonymously downvoting it.