My thought run about three ways, and one is just a continuation of the other.
The first is that due to the fall out of the US Presidential elections Google and Facebook are examining what could compose *Fake News* more closely. I have also seen that now that there is nearly unanimous agreement in medical communities about the dangers of medical quackery and I have seen several sites shut down over this alone. Google and Facebook are, in the end and subject to US law.
The next issue that none of us really know at this time is how many parasite sites there were supporting that site. I remember Penny's being deindexed many years ago for parasite sites that seemed to exist only to provide links for Penny's.
The third thought is PBN's. PBN's are really nothing more that an extension of the parasite site above. They are a little more complex than a simple parasite, but parasites they are. Google is coming down on PBN's because they manipulate page position. Also, the artificial intelligence Rank Brain may have seen something we do not know about.
If you run a simple link test for natural news dot com @"link:naturalnews.com" you find many links that are not so nice about the site. About 538,000 links calling the owner a scam and bullshit artist that was giving information that is harmful. Some of the material also suggest link manipulation.
https://www.google.com/search?q=link:naturalnews.com&ie=utf-8&oe=utf-8