I think the chapter named "deliver value" + the question asking is where he describes the qualities to look for in the hiring. The last part I read it as "if you keep filtering through technical stack you reduce your possibility to find these people because you will look only in a subset of the market"
But I have to say I’m disappointed in the conclusion about hiring. Early in the article it teases that PEs are “easily identifiable” in the interview process. But the final conclusion is to just ask general problem solving questions and not require specific language expertise, which I’d argue most companies are already doing. Consider the classic FAANG interview - general problem solving, interviewee picks the language.
Would have loved to see this part fleshed out more because I agree with the general premise of the article and also think there are real ways to identify PEs at the interview stage.