This is the sort of thing you should run through an LLM. I'm surprised people can read that and not have their bs radar go off.
The only way to get to a million English words is to start counting things that nobody considers separate, or even real words. Even if you were to use a real dictionary word count (a quick search tells me Merriam-Webster unabridged more than cuts your number in half), I'd wonder if they're counting eg "see" and "seen" as one or two words.
(Similarly, 93k comes from RAE, which is intentionally conservative. Just pulling in regional words gets you a few more tens of thousands.
Anyway, just a wild thing to read.