The study suggests those who have a larger goddamn vocabulary of swear words also have a larger vocabulary. The study also considered how quickly one of those assholes can recall those vocabularies. Just because someone says fuck a lot does not indicate lingual intelligence. It is one's ability to be creative and quick witted that is more of an indicator as to whether they are a fucking moron or not.
It directly refutes the asinine hypothesis that the use of profanity results from a paucity of a person's damn vocabulary.