Exactly, Wikipedia is the first step for almost every expert professional in every profession. We all do it, and the world is better for it.
Also the causality of the argument in the linked article seems clearly backwards anyway: it's not that "Getting a wikipedia page for your case makes it more likely to be cited", it's "More important/citable cases are more likely to have a wikipedia page". Which is sort of an obvious point.
The linked article is describing a randomised trial, which looks like it was set up in a way that's good enough to be sure the causality goes in the former direction.
Also the causality of the argument in the linked article seems clearly backwards anyway: it's not that "Getting a wikipedia page for your case makes it more likely to be cited", it's "More important/citable cases are more likely to have a wikipedia page". Which is sort of an obvious point.