Why does your friend not just use a grocery delivery service?
I think it’s pretty easy to draw connections among “unable to leave house in fear,” “unable to work,” and “unable to afford food/grocery delivery services.”
Also, digital fingerprinting would easily identify individuals who would not deliver groceries to their immigrant neighbors. Pick out the more vocal members of the remaining people, find which ones are active in community social media groups, and you have a list of people that is much smaller than just “white people.”
Big brother, but the kind that just wants to take good care of their relationships with their younger siblings instead of doing surveillance