Hi Monte. Yes, all you need is the Fan Club Card. But, you don't need the card to make the ressie -- you just need it upon check-in. I would go ahead and book with the Fan Club so the rates don't sell out. It costs you nothing to cancel when you book directly with the 800-BE-A-STAR, as long as you cancel within 5 days of your arrival.
That way, if Hotel Kingdom has another great sale, you can cancel and rebook at no charge. (Hotel Kingdom, on the other hand, charges a $10 cancellation fee.)
Hope that helps!
Jodie