Look, it's like me writing an introduction to "colour theory" and then writing about something else that eventually leads to how we see colour.
I'm not debating that the article has useful content – it does – but it's title and framing is misleading, which is a disservice to the new student. I happen to personally believe everyone getting into music theory would be well served by knowing more acoustics and that this is useful material. But muddying the waters by using terms in weird ways is off.
And when you write about a field and use the wrong terms, you lose credibility. Sorry, I don't trust authors who can't be arsed to use the standard nomenclature for a topic, it really doesn't make them sound trustworthy.