Setting a max-width on the body text would make this incredibly more readable on narrower viewports. At 636kb and 48 requests, this page probably isn't as "minimal" as you think it is. For example, should there be any reason you can read the disqus comments at a reasonable size but not the body of the post?
I tried it on mobile. It still loaded fast. As with many pages, Firefox Reader Mode improved the experience. Though for me, the bulk of the improvement comes from text formatting, part of the improvement is hiding blog comments, ads, email signups, etc.
Anyway, my experience is that touching Firefox's reader-mode icon in the address bar is usually faster than a boatload of formatting logic; produces more readability than a website's general optimization, and bypasses all the ancillary crap that people concerned enough to optimize for mobile tend to add.