Let’s say you are in a club at a community college. Do you think that the UC transfer admission counselors would call your college and check to see if you are really in that club?
Are you actually in the club that you listed? I don’t think they would do that for every applicant, honestly. It would take far too much time for them with the volume of applications that they receive. That being said, they receive enough applications that they can likely weed out who is adding fluff based off of wording, etc.
Unless you hold a position within that club or intend to write about it in the essay portion, it is unlikely that the admissions officers would give two thoughts to it.