Here is what the VH web site says:
Primary Care Done Right - The Villages Health
I think what the site is saying is that if Medicare is going to pay for their services it has to be the UHC advantage plan. But if you are not using part B and have a commercial plan that covers primary care you can use that. But you have to talk with them to find out... never trust any web site to have up to date or clear information about anything you care about, ever :-)