And not only is it incorrect, it is obviously incorrect. The website owners do not pay Google for clicks on the "10 blue [organic] links"; so it gives Google no business advantage to make them more commercial.
Since they have an ad monopoly they have incentive to link you to stuff that shows ads, which will in all likelihood be their's. Spammy medical sites with google-run pill ads vs the wikipedia page for the thing you searched for (often not even on the first page anymore for medical terms).
The author is not saying that. They're saying google manipulates what those 10 links are to generate more money (bc of reasons like those sites serve more google ads).
And not only is it incorrect, it is obviously incorrect. The website owners do not pay Google for clicks on the "10 blue [organic] links"; so it gives Google no business advantage to make them more commercial.