One possible explanation is that he might be experiencing depression. It's probably not the first thing you would think of when you see scattered writing, but since it's an article about how he's unhappy, it could be a reasonable explanation. Unhappiness can definitely interfere with thinking and writing, if it's severe enough. That's just a thought. He also says the idea is "disjointed". Often too, when you are feeling uncertain about your life, it sometimes helps to put down a stream-of-consciousness collection of thoughts to see if anything provides meaning.

From reading this article further, I think this a depressed person trying to make sense of their world and emotions.