Authentic cuisine as a term is troublesome. Having lived in Mexico for a couple of years and traveling around most of their states, and living in the southwest currently, I will submit that authentic to one person is not authentic to another. It depends upon region, what you ate growing up, etc. Do I look at TB as a representation of MX cuisine? Not really. Same as most of the monstrosities we call sushi isn't really "authentic". I've also lived in SEA/Thailand, but damned if I hardly ever find khao nao here. Or having grown up in the NYC-area, I have strong opinions on pizza; however, things like Dominos/Papa Johns serve a purpose on occasions. I take food as it comes without worrying about labels and more so on taste. And TB is delicious food-adjacent stuff.