I haven't even realized that while I was reading the article, but it is amusing!

Though one explanation is that I think for the other stuff that the writer doesn't explain, one can just guess and be half right, and even if the reader guesses wrong, isn't critical to the bug ­— but sockets and capabilities are the concepts that are required to understand the post.

It still is amusing and I wouldn't have even realized that until you pointed that out.