Yes this is a wildly misrepresented statistic that has nothing to do with DEI and everything to do with demographic shifts in the U.S. population (specifically, that the "non Hispanic white" segment of the U.S. population is shrinking).

Thats true, and enhanced in places that reward that characteristic. Hispanic origin is tied to lineage, nationality, or country of birth for an individual or ancestors.

It’s a vague definition that is impossible to verify. Spain itself is a multicultural and multiethnic state. How do you prove that I don’t have deep affiliation with my basque ancestor who settled in Ireland after a shipwreck?

affirmative action for hispanic people has always been uniquely absurd and exploited by effectively white europeans for as long as it has existed. my college counselor told me to mark "hispanic" on my college applications because I'm of Iberian descent, which I refused to do - but I know of multiple others who did and went to Harvard/MIT.