Social sciences is an oxymoron. Problem with social sciences is not only this issue that the article points out, but that the vast majority of it is not reproduceable.
Physicists don't assert that they study "physics science", nor do chemists describe their subject as "chemistry science".
It's only a rule of thumb of course. There are exceptions (computer science, neuroscience, ...) but I think it works in a lot of cases: "social science", "management science", "data science", ...
It's a bit like how if a country includes the word "democratic" in its title, it's less likely to be a real democracy.
> Physicists don't assert that they study "physics science", nor do chemists describe their subject as "chemistry science".
Fortunately, most of the people in question study "economics", "psychology", "sociology", "anthropology", and so are exempt from this heuristic.