Do some of you think a White or Black kid who spent 11 years in Mexico is now Hispanic? Half a generation? Parents not born there, who knows how much real ethnic involvement. For all we now, they could be diplomats living in an enclave. What this is is just an interesting turn of fate, and if OP plays his cards right, an unusual experience he brings to the table.
Here’s the issue with this as an essay topic: you’re supposed to show, not just tell. In this case, that’s not show why this “makes you” Hispanic, but how this heightened your attributes, changed perceptions, somehow activated you in good ways, etc. Not just, hey, this is where I lived, I speak the language well, so it’s what I am.
Check whatever boxes you want but it’s still more than claiming it. Adcoms have to see it.