While Falls Lake is a huge piece of property that would be great to utilize for HHN, I have high doubts those sets are for HHN. That area is constantly used for filming and to keep it out of commission from April - November would be insanely costly. Especially because any time a production does use that area, it is for BIG movies with huuuuge budgets. If that area is being used, then it's a lot of money going into it. Even using it for a HHN commercial isn't likely.
If this popped up last second end of August or early September, I'd maybe believe it.