I appreciate the critique!
Sometimes when I'm thinking about a blog post, I fall in love with a joke I want to use, but then it constrains how I think about the topic. I still like the David example, but I'm too close to the post to have a balanced perspective, just having finished it today.
It made perfect sense to me, FWIW.
Paintings, sculptures, blog posts, HN comments, etc. are all examples of different things that can be reductively viewed as "content" by those who only want to exploit them for profit, just like the illustration shows. I don't think the article is saying that these things are all the same.