My vote says that it is effective with any group because you’re engaging students. Im personally a very selfish teacher and need instant gratification, so my class is never quiet, even though I ‘lecture’ half the time.
I used to get in trouble for the lectures, even though my style demands participation, but I ignored my teaching professors and no one suffered.
It was commented in the 70s that we need to rethink how we speak to black kids. Not sure that caught on with white teachers.
Im white btw but I’ve only worked with Latino students. I’m gonna go out on a limb and say its proven but not widely practiced.
Edit: you don’t have to sound like a black preacher to teach black students. They aren’t stupid- not sure what this article was aiming at, exactly. But you do want to make your classroom a community, and I could see how teachers drop the ball on that one.