Because the finding is more accurately described like "Latinos[0] moved towards Trump". If that's related to the latinx thing, it might be something like "... in part because they generally resent having this 'latinx' thing pushed on them".
[0] Here in Canada, as far as I can tell "Hispanic" is the accepted term - but it's rare for people to identify that way generically (https://en.wikipedia.org/wiki/Ethnic_origins_of_people_in_Ca...). People here far more often attribute their ethnicity to a specific country of origin rather than to some generic grouping.
It's strange for the author to distinguish "those who dislike the term" from those who don't, considering that the term is overwhelmingly unpopular (https://www.pewresearch.org/race-and-ethnicity/2024/09/12/ho...).