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I figured those were OCR errors or something. How would this help maintain originality?

No, this is intentional. Here's the original book on the publisher's own web site:

There's a footnote on that part "Cf. the note on Moralia, 190 B, supra", but I'm not sure what that's referencing.

This footnote refers to Sayings of Kings and Commanders[0], another text of Plutarch, but is not related to the translation.

That's 190 C. It might be this bit about Doric somethingorother