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The author has a PhD in computer science from MIT. You'd think he'd know computers.

Having a degree or special title doesn't mean you're any smarter than others and not having one doesn't mean you aren't.

Having a degree in computer science does mean you know more about computer science than others.

It ought to at least correlate with more knowledge, otherwise what’s the point?

To sell the product

Let me rephrase: otherwise what’s the point in getting a degree?