because real estate agents simply won’t sell to them.

It's also because our state and local officials either A) completely misunderstand how to distribute Low-Income Housing Credits or B) Have a full understanding of the consequences of concentrating poverty within a central location via Low-Income Housing Credits, and do it anyway.

If you do not spread the LIHCs around your state / city within “High Opportunity” areas, you just compound the poverty. When you stack poor people on top of poor people under the guise of “Well this area is full of poor people so let's designate more LIHC there because they need them.” you just create a multiplicative effect on the areas' poverty. No one can afford to patronize the businesses in the area, and no one living in the area can afford to open a business. Which means no local employment for the poor, and no local commerce for the poor. They have to travel for work, travel for groceries, travel for everything. This means they're either buying a car and maintaining it, or attempting to rely on dilapidated public transportation.

What you get are dens of poverty that actually make it even harder to rise out of poverty, and total segregation of a population that ultimately skews black and brown. The real estate agents hardly need to expend any energy to be racist when the structures they work inside of area doing most of the heavy lifting for them.