TL;DR? Why not just go watch another five second video of a kitten with its head in a toilet roll, or a 140 character description of a meal your friend just stuffed in their mouth. "nom nom". This blog post is not for you.
Way before "tldr" became something on the internet, research papers had an abstract and news articles had a lead that tells you what the article is about.
I think this article is very good but replacing the abstract/lead by a snug paragraph is not a good idea.
Fun fact, the top part of a news article is actually called a "lede". This originated not because it's actually a different word from "lead", but because in written form the latter could be confused with the metal "lead". It's described as "a deliberate misspelling of lead".