People looking to minimize the impacts of racism, believe that Black teachers help through the "role model effect." That's part of it but not the whole story.
There are few enough Black teachers in this country, that we can literally ask a good portion of them what's really happening. It's not just the role model effect. Teachers are shielding Black kids from racism.
Until they can't anymore...
The typical education experience for a Black boy in the United States, is to have almost all white teachers, mostly women, more than half of whom vote for the most racist candidate on any ballot, and no Black teachers. The teachers have low expectations of you, punish you more than your classmates, and threaten to call the cop who works in the hallway on you at any moment.
I don't know how to explain more clearly, that this is never going to work.