Is that page served from a secure domain anywhere?
Not quite. The Wikipedia page is worth a look through if you don’t want to click on an http page. https://en.wikipedia.org/wiki/Bitter_lesson
You could read it through internet archive if it's this important.
Out of curiousity, I like security just as much as the next guy and ensure that certs are valid, ciphers are fresh, and protocols are mature, but I am also not really concerned with an informational site that runs http being browsed. Would you mind sharing what your concern would be with browsing this content over http?