I was eager to see the data, but exporting from the first source only gives the same data shown in the article, although in a spreadsheet.
The explanations in your second link are more like definitions than justifications for why this and those boiled down quantities are worth talking about.
I'm not trying to excuse them, I just had similar questions and googled around a bit and those looked interesting to save the next person a couple minutes! I also shamelessly sorta use my own HN comments as a brain dump sometimes for myself in the future.
The explanations in your second link are more like definitions than justifications for why this and those boiled down quantities are worth talking about.