I strongly disagree. How does one even acquire knowledge of military history without language skills? Youtube videos, TV shows, and movies are not "advanced level education" (their words), but writing research papers is. Even if they somehow soak up the knowledge without reading, if they can't write at a higher level than what I'm expecting here, they're still going to fail their classes.

This person is either lazy, sloppy, ignorant, apathetic, or some combination of those. Why on Earth would I want them as a teacher, when there are millions of other educators who don't have these issues? It's a red flag is all; that's my entire point. Of course, there are brilliant educators who cannot write, but the vast majority of people who have gone through higher education know how capitalization works in sentences. Again, just a red flag, not an absolute.

Basic language skills aren't an above-and-beyond expectation from someone calling themselves an educator, it's baseline. When even that's not met, it brings doubt to everything else they may say. Maybe you're fine with that, I am not.