I guess the dude either has not heard of KPFA (Pacifica Radio, Berserkeley) or doesn't receive it. I think there's at least one NPR station (KQED?). KGO has had a couple of mass talent lay-offs in the past 2-4 years, but "Moderate or Rightwingish" is a serious overstatement. KFAX, 1100, has been a Christian/religious station for decades, and while Family Radio traded ifs FM station for KFRC's old AM 610, that happened quite a while ago (more than a decade?). Some of KGO's laid off talent went to a station also owned by Cumulus, and are basically liberal.
But, exaggeration aside, conservative station KSFO is the big TalkRadio gorilla in the Bay Area. It's successful.