No, you are incorrect.
Don't be confused with the idea that "mental" is somehow the only aspects that had lasting effects. The physical torture that slaves went though was great as well. If anything, it allowed for the mental torture that you highlight. If anything, this film and other "slave movies" don't do enough to show just how brutal the physical torture was. If you are Black, it is a shame that you shucked and jived and tap danced to what you were fed about the physical abuse "was nothing in comparison to....." blah blah blah. If anything, movies need to show just how brutal it was and this movie only tipped the iceberg.
While I will not question your education and/or comprehension as you have done....I will say that if you stand by what you wrote, it is proof that mental slavery served it's purpose unfortunately.
Also, if you care to listen, check out Derby's Doses...but then I guess that was not important.