It technically always is, though people tend to confuse the issue of "Ethnic Group" and "Race" as it were. Race is much more inclusive than Ethnic Group, yet time and again the various "Races" fight among themselves because of Ethnic tensions. Technically the "Hispanics" are "White" racially, given how most of them tend to have more European genetics over Mezo-American genetics (Thank ya very much you Conquistador rapists and religious in-group preferences!). Just as most of us "Americans" have some "Indian" genes flowing in our blood (which means the "genocide" we supposedly committed against them is BS as you don't interbreed with anyone you're trying to genetically purge from history. No SS officer/1488er worth his/her salt ever contemplated banging a Jew/Jewess y'know).
In the end, it is about race, but it really isn't. The whole immigration game is the same as the globalization game. It's all about the big megacorps securing a source of quasi-slave/peasant labor. White people, finding slavery abhorrent way faster and harder than any other race (and contributing most of the work towards making it a global taboo), just won't bow down to the whip. Thus the need to Genocide them among the upper echelons of our current society so that it can be a real thing again without some almost certainly white Spartacus figure uniting the slaves under a banner of Freedom. Can't have those hyper-moral white people ruin a good morally abhorrent scam!