Rowan County could easily be in either market, but Charlotte being the larger city probably pushes viewing towards their stations. As late as 2023, WBTV had a news bureau downtown, and I'm assuming they still do.
When we would travel through there in the 1970s on vacation, and would stay overnight, the hotel TV carried stations from both markets, and I would have just assumed they were in the Triad market. I'm not sure TV markets were that sharply defined in those days (though Broadcasting Yearbook showed them as early as 1975, the first year they started publishing maps).