Author states that if you contemplate the two graphs you'll have an epiphany. Quite right, it went "Wow, that is not how you analyse data and I'm sure I heard about an actual investigation with cited sources and actual math and everything which came to pretty much the opposite conclusions". [0]
The link you cited seems to be answering the question "Does more education for an individual decrease poverty for that individual?", while the original post is answering the question "Does more education for a society decrease poverty for society as a whole?". These are two very different questions, and it is quite possible that they have opposite answers.
[0] https://cew.georgetown.edu/cew-reports/valueofcollegemajors/