The article doesn't even rule out the obvious possibility that the problems are just due to a bug in Chromium, and not some malicious behaviour on the part of Chrome. After all, both Chrome and Chromium share a common code base and it's highly plausible that there might be some issues with running them side by side.
Also, part of the problem might be due to the fact the author didn't purge Chrome with `dpkg -P` but only removed the package with `dpkg -r`, leaving Chrome conffiles intact, which then broke Chromium.
So until there is at least some indication that the problem isn't just due to one or more bugs in Chromium, the author's claims are seriously exaggerated and the article is effectively clickbait.
The best way to deal with such problems is to engage with Ubuntu, Chrome, or Chromium support systems and community forums.