I come from a more privileged background than I realized and that included better educational opportunities. I was in gifted programs as early as second grade and had several college-equivalent math classes through my high school by the time I graduated high school. I took more math in high school for free than a lot of people with (non STEM) bachelor's degrees take.
As a homemaker in my twenties, I kept running tallies in my head for every single item that went into my shopping cart. I never bothered to carry a calculator. I could run the numbers in my head faster than other people could punch it into a calculator.
So much knowledge and training makes sparse material resources stretch a lot further than people stumbling their way forward with limited finances and less education, fewer solid mental models to inform their decisions, etc.
I mean, I appreciate that she wrote the article and she's not wrong, but I think the issue runs so much deeper than she's indicating. Just because I had smart parents who knew a lot, I had a leg up before I ever started school at age five. And the gulf between me and most of my age mates only grew the older I got.