That wasn’t what the professor was saying. She was not saying that it wasn’t a Hispanic word, but that wasn’t the way she usually writes her reports.
Maybe the professor did google phrases in her report to see what would come up.
Or maybe he (or another prof) told her previously not to reuse the same words/phrases in her writing so many times and she was using a thesaurus to improve her writing...I’ll take the bet on the side of the latter.