I couldn't stand the wall of text on such a wide screen that I have. But the TLDR seems to be not to hire based of trendy skills, which I agree with.
No, the essay is not about skills but about trendy pedigree. The examples of "pedigree" being defined by being at trendy company such as Google/Facebook/Apple instead of a stodgy one like Microsoft. Or the "pedigree" is graduate of top-10 university instead of a 2nd-tier one.
One possible solution to outsmart the flawed thinking about pedigree is a "Moneyball" approach that ignores schools or past employers.