I find these <strike>anti</strike>-CoffeeScript articles annoying. I use CoffeeScript, because it works for me. If it doesn't work for you, whatever, write plain JavaScript.
This article just argues over what is and what is not a language.
This article just argues over what is and what is not a language.
But the title says "CoffeeScript is not worth learning".
No, it says "it's not a language worth learning". The author's point is that CoffeeScript is not a language, but a tool for JavaScript.