Earlier quoted context omitted.
I was similarly surprised, but it's true. The original text is essentially the exact same (probably a 99.9% overlap) with the exception of a few spelling mistakes or grammar errors. My editing was about as much as you'd get from Microsoft Word, if that.
So you're telling me now the big challenge for AI is no longer making sense, it's spelling and grammar? I don't get it.
This is a word predictor fed on billions of tokens of text. Because it has been trained on human writing, it makes characteristically human mistakes (including spelling, grammar, and even some phonetic errors).