Also, he makes the assumption that you've read other stuff by him, which creates a decent sized inferential distance. This alllows him to cover more material per post. This is a pretty common trope among blogs, including this one. But it can be confusing.

I tend to just ride the wave of confusion until something later clarifies it, but that makes skimming nearly impossible. I like styles that make me read every word as important as it helps me remember what I'm reading.