[Tenoke]

>A student’s mindset, as opposed to innate ability, is the primary predictor of one’s ability to learn math (as shown by recent studies).

The article seems good overall, but I only skimmed the rest after seeing a citation of a 5-year-old Atlantic article describing disputed and at minimum highly exaggerated findings presented as 'shown in recent studies'.

[mkl]

That may be a bad reference, but there are lots of studies about this. See the book Mathematical Mindsets by Jo Boaler for many references.