This is wrong: sites that provide general high-quality journalism do not give a strong signal about the user's interests. If I'm reading an excellent, well researched article about the origins of the fire crisis in the American West, there is no strong commercial tie-in. Highly commercial journalism is in good shape, it's local and in-depth generic reporting that's struggling.
Additionally, advertisers will pay far more to advertise on a prestigious site than to advertise to the same users elsewhere. The article is worried about something that high paying advertisers aren't interested in, because they care about prestige and association, and not just which particular users see things.
(Disclosure: I work on ads at Google, speaking only for myself)