that wouldn't matter
the school isn't going to say... well we have x number of students that reported themselves as hispanic...
But we have an inclination that Y students are hispanic, but just didnt want to tell us, therefore we have x+y hispanic students
the "diversity numbers" are the ones reported
A school doesnt really get anything out of just for kicks admitting a student solely because their last name sounds hispanic
they DO however, get something out of it if they marked themself as hispanic
otherwise, your just one of the 10-15 percent of presumably Asian/white students