> Somewhere in this section — and if you’re like most readers, it happened around 1300 or 1200 — the language crossed a boundary. Up to this point, comprehension felt like it was dropping gradually, but now it’s fallen off a cliff.
This is generous to his readers. Most American college students majoring in English can't read Dickens, according to a study discussed here last year [0].
People reading a post on a blog about dead languages are self-selected to be better at this task. But so are people who've decided to spend four years of their life studying English literature.