This article is criticizing Google for showing reviews and guides to consumer products from well-known publications that it argues are increasingly low-quality, instead of surfacing high-quality independent reviews from less popular sites.
But this has nothing to do with Google. Google's search quality metrics are pretty simple -- Google is trying to list results in roughly the order of probability that people will click on them. Google is trying to get you to the information you're looking for the fastest.
And the reality is that, if I'm looking for air purifiers, I am absolutely going to click on the links to well-known publications like Wirecutter, or Better Homes & Gardens, or Apartment Therapy -- or a forum like Reddit. I'm far less likely to click on some smaller site I've never heard of, because I trust it less. So Google is giving me what I want.
And the idea that Google should somehow instead be analyzing the content of each product review site to try to determine whether the reviewers are actually independently testing the items or not, that it should be making some kind of determination of "real" quality separate from whether people click on it -- this seems both impossible and misguided.
I don't want Google to be trying to pick which niche independent sites are high-quality or low-quality. I just want Google to avoid actual spam, and otherwise give me the results that lots of people link to and lots of people click on -- PageRank and all that -- which is, of course, going to be publications and sites with brand recognition.
Google isn't killing small, independent sites. It's people -- users, consumers, people like me -- who generally aren't interested in small, independent sites because there's no reliable signal to determine which ones are good or trustworthy.
If I'm looking for an air purifier, I don't have time to waste to look through 20 small, independent reviewers and try to figure out which ones are shills and which minority actually know what they're talking about. No -- I'm going to go to the major review sites, see which models keep popping up, check Reddit for some confirmation and Amazon for some sales rank figures, and make the purchase and get on with my day. Which sucks for small, independent review sites. But they're just in a tough business. And Google has nothing to do with that.