Unsurprisingly a TV show based on affinity for Louisiana or affinity for LA will have by far the strongest signal be predictable affinity for either LA area. Likewise the identity politics, its very hard to express surprise that a TV show carefully engineered to appeal to black people, successfully sells to black people, therefore the map of viewers extremely strongly resembles a population map of black people.
If they had corrected for those effects THEN they would have had interesting data.
I did find it interesting that "deadliest catch" correlates more strongly with latitude than distance from the coasts. I've never watched, but I'd assume its mostly set on a boat?