You've answered your own question. Texas Hold 'Em sounds like something you'd hear on contemporary country radio before you'd hear anything neo traditional or 20th century. What might be throwing music directors off is the R&B soul over-emoting singing style, and some of the curse words. Other than that, it sounds pretty modern country to me, and worthy of play based on the slick production, its uniqueness and the fact that it's made by a global superstar. Why wouldn't a music director want to play it, and why wouldn't modern country fans want to hear it?
There's a gatekeeping aspect to country music that I don't like. Even rap music is less gate-keepy. Beyonce grew up in Texas, and probably heard country music regularly, and as a musical person, probably enjoyed some of it. The idea that you can't "be country" if you've never made country music before seems absurd. She may not have paid her dues in Nashville, but she paid her dues in Houston. Artists should explore different styles, and country should be no exception. Popular artists like her have probably earned the right to get a fair shake on the radio. Not that I care if she doesn't, I'm not a fan of any of her music!