OP, I think I see what you're seeing. When I search on Disneyworld.com for Boulder Ridge or Copper Creek for Dec 11-17, I see this at the top of the search results:
"Standard View
at Disney's Wilderness Lodge"
It shows a nightly rate.
If someone wasn't paying close attention, they might think that they were getting what they wanted. But you are correct, those are regular Wilderness Lodge hotel rooms. BWV and CCV have studios and villas (and CCV has cabins).
If you scroll toward the bottom, where you see the studios and villas, you see this:
"This room type is unavailable for the
dates, party size or offer selected."
That doesn't surprise me. I would have been more surprised if you had said that you
could find rooms available on Disneyworld.com at CCV or BRV for December. I think Disney itself only owns a small number of points at each of the DVC resorts (except the very newest DVC resorts). Sometimes Disney gets more points, such as when a member trades in their points to use on a
Disney cruise.
It is weird that when you search Wilderness Lodge or Copper Creek or Boulder Ridge, you get the same search results: hotel at the top, both CCV and BRV at the bottom. I don't know if it's always been like that. I never tried to book a reservation on Disneyworld.com for any of them.