I am a CS person. If the article is not readily consumable for a CS person why is it on a website called "Hacker News"? Seems like a bad submission if you ask me...
Like many before you, you appear to assume Hacker equates to the C in CS.
I too cannot ~"readily consume" it, but I now have a few more tabs open in my browser from which I will learn a lot.
[1] in the original meaning of the word
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.