It must be about some ideal world, where people become managers to do better good (as opposed to e.g. maximizing bonus or doing more talking than working).
Management is really hard, don't blame the faults of the bad managers on the good ones. I moved into a management role recently for the reasons described in the article: I wanted to get more done than I could do myself.
Also, management is a people oriented job. It's not surprising it involves a lot of talking.