Native and mestizo aren’t the same thing. Mestizos are the people that assimilated and therefore enjoy privilege over indigenous people. identifying as mestizo is kind of the opposite of being indigenous because you’re adopting a colonial identity.

We don’t go asking Italians before we put stuff in Latin.

except Italians aren’t being genocided by any state for being Italian. Latin would be Spanish in this context, not Nahuatl. Latin was imposed through colonization around the world. And before anyone brings up the Aztec empire, it hasn’t existed in centuries.

Mexico forces Spanish upon indigenous groups to bring them closer to the conquistador ideal of a good Mexican citizen. them appropriating Nahuatl words to seem cool is more akin to racist Republicans stealing words from Black American English to market their products or politics.

Mexico is a bit different from America in their approach to assimilation in that they strive for mestizaje (making every Mexican mixed). You can see the ideology behind it in La raza cósmica.

I think it should be obvious why erasing indigenous cultures through state violence isn’t a benign thing.