The best explanation for why the author might have chosen to use the Spanish word "cultura" instead of the English word "culture" in this context is:
The author wishes to highlight the uniqueness and specificity of Hispanic cultural practices compared to more generalized notions of "culture."
Using the Spanish term can convey that the author is referring to specific cultural elements and nuances that are intrinsic to Hispanic identity, further distinguishing it from broader, more generalized interpretations of culture.