John, It's my guess, because they included the rating number, the list was simply pulled from the database that Brad has created.
Now, it is possible that the data does not include whether or not it is owned by a municipality. However, I suspect that's not the case. With only 30 to list and Pinon Hills in the top 5, Gold Mtn would have a hard time making such a short list. I agree that GM is a good golf course. Better than PH? Not in my votes.