Because the author related 2 anecdotes din't mean they're the only ones they witnessed. They may have seen a pattern over time.

... which should be mentioned with numbers. Otherwise go by what's in the article - 2 anecdotes. My anecdote is that I'm > 40 but highly saught after engineer,by several CEOs far younger than me. But I know it does not mean that's the general pattern.

Edit: everything in the article was a good read, except the generalization in its title