Googled 'what is a Hispanic' and is 1) relating to Spain or Spanish speaking and 2) one who is Spanish-speaking, living in the United States, especially one of Latin American descent
I'm not certain there has been a Legally-defined SOTUS-judgment on just what a Hispanic is, and if not what is the base-line definition for Hispanic as used in the United States, for instance.
One thing that gets in the way is that someone whose parents or grandparents came from say Morocco to Spain, the child or grandchild is Spanish, born there, speaks Spanish and only rarely have I read that the 'of Moroccan' ancestry is mentioned (unless he / she blows up something, in which case, Spanish or not, they're suddenly Moroccan instead)
Yet the same Moroccan ancestry in the United States turns out to be American-of-Moroccan descent or just American (and speaking English isn't even on the list) and there's no DNA test for 'American', whereas there is apparently (claims abound) DNA test results that will say 'northern Spain' or 'lower Peru' or whatever the case may be
Don't think there's any certain path to judging (by outsiders) whether one is Hispanic, or entitled to claim one is Hispanic. Is there a DNA test result that says "Hispanic"? IF so then you could take that test.