its true that all genres are in a state of continual adaptation to changing taste... but there are normally traits that define a genre and make it different from another genre.

The original question asked us to point to ANY part of the song that might have a common denominator with other songs in the country genre. The inclusion of a banjo part seems to be the only one

So in this case, I still say that (even accounting for the natural evolution of genres) this is less a "country song" than it is a "song" performed by a country artist.