I see your point, but I see a world of difference between "good at math" as you've used it here and as it's used in the article. When you (or I) hear "I'm not

I see your point, but I see a world of difference between "good at math" as you've used it here and as it's used in the article. When you (or I) hear "I'm not good at math", you presumably take that to mean "it doesn't come easily, and I certainly wouldn't want to study it full time". But I think that when a lot of people hear the words "good at math", they take it as a statement about just basic competence. People saying "I'm not good at math" all too often mean "numbers scare me" or "I would never be capable of understanding that at all". And I think that's what this article is responding to.