Ah, a classic paperclip maximizer. Pension plans got the goal of multiplying the money so pensioners have more of it. Nobody bothered to mention that they should also make sure there's a world the pensioners can live in, so now that gets slowly sacrificed in the pursuit of the only explicitly stated goal
If multiplying money is the goal why does the article say they're doing a worse job of that than just buying index funds? If that claim is true, then clearly there are other issues at play than just that.
For example, CaLPERS has ~45% of their assets under management in debt / real estate.