Searching for "Rex Tillerson" is the perfect example. (Remember him?)
Typical news searchers are looking for a much wider swath of news than just the latest on the former U.S. Secretary of State. In my own experience, that includes local news (what were all those police cars doing last night?) and lots of sports news, business/tech/entertainment news, scientific news, etc. Those articles come from a much wider assortment of news outlets, and I think Google does a decent job of finding them.
There's a limit to how many news organizations can generate meaningful coverage about Rex Tillerson. I'm at peace with the idea that Google has found most of the ones that matter.
I wish they simply skipped narrative driven, opinion filth and stayed with factual reporting from AP, Reuters, NPR, ...
In the last 5 years, NYT, WaPo,.. have wholly embraced narrative driven opinions instead of sticking with plain news, because anger sells
I think geography affects search results a lot. I'm in a blue city, but red state.
I've been hitting Google News without a logged-in session (but with my real IP address) multiple times a day for 5+ years.
I noticed the increase in Fox News as a source around the time conservatives were complaining about censorship a year or two ago. Interestingly, though, Fox News is rarely the source for a major political news story -- it's often their fluff pieces that hit my feed.
The article's data was far from closing the book on this topic.