It's not only about fake science, don't forget the authors and a reviewer lied about their affiliations and conflicts of interest. When a Journal Editor and a publisher realize that they were deceived by plain lies, I would expect them to react as strongly as they did.
There are some specifics about which parts of the paper had problems, but I can’t find the original paper to see how those parts look (failed to find at libgen, doesn’t seem to be open-access from what I can tell)