I don't know that I'd agree that claiming some latin music is grounds for culture appropriation, not while Texas is still one among us. There are many states, especially in the south, where spanish language folk music is certainly common. I think that's the point the article tries to make- 'folk music' is often synonymous in the US with a sort of Country Lite. It's viewed as a genre rather than as a representation of culture, a genre of broken-hearted white southerners, which is quite the wrong definition.