The problem is that too many black folk are totally unaware that this "prison" he speaks of even exists.
That's how ingrained and creative systemic oppression is. Even the things that are right before our very eyes and are being used as tools in our continued oppression, we simply call "entertainment" or dismiss as a "conspiracy theory".
"Brainwashing" is the most effective tool of white supremacy. Its been a tool since the slave days:
What brainwashing does is make the slave totally unaware that he/she IS a slave. Y'all already know the Harriet Tubman quote