Well he said he did, so yes. And I'd hardly call California wine "famous." Napa Valley is really the only part "famous" for wine, and I imagine if wine doesn't interest you, it's not a fact you'd come across too often.
I've lived in CA my whole life, i even raised my children and their childrem and their children before them here and I missed the scientology question!!
Furthermore, California wines have often been judged superior to French wines in blind taste tastes, most famously the Judgment of Paris.