I'm going to go by this a bit different.
First, IF it is true that he is canceling ads in rural areas to focus on major markets, that is wise, not because you take them for granted but because it gives you the greatest bang for the buck.
However, two of the states listed, Florida and Main, are primarily dominated by just major markets. Going down the primary network listings for those States, they don't have a whole lot of rural markets to buy. Miami TV market, for example, covers most of the south of the State because the State is so narrow. Maine only has a couple of markets, both major (relative to the State's size).
Usually major market buys would have already hit the rural markets anyway, and that's the case in most States.