Perhaps, but what she said seemed to imply they're using the word WRONG, whereas it seems they're using it perfectly correctly, with particular subdivisions to denote THEIR fandom. General SF Fandom covers some people, but it doesn't cover those who have no interest in written SF. And those who have no interest in general SF but interest in one particular show or subset thereof are definitely *SOME* kind of fandom, as in a kingdom of fans, and their fandom is defined by their show or shows or books or manga or whatever.