The contents of that hardcoded dictionary are really weird, too. It includes a lot of bizarrely specific entries like:

    in popular culture
    Holy Roman Emperor
    It is important to
    examples include the
    have speculated that
    aria-hidden="true">·<
    (new Date).getTime()}
    :url" content="http://

Many of the English phrases (like "in popular culture"!) are highly characteristic of content from the English Wikipedia. I've speculated before that this may be the result of the use of a compression benchmark which included (or consisted entirely of) content from that site, such as https://cs.fit.edu/~mmahoney/compression/textdata.html

If you're curious, here's a full dump of the dictionary:

https://gist.github.com/duskwuff/8a75e1b5e5a06d768336c8c7c37...