He is spot on correct. He neglects the fact that there were many slick clever boxing wizards that were white, which is typical. Archie moore did the same thing despite getting out boxed by one of them in Teddy Yarosz.
Boxing has always been about hit and don't get hit. Sadly there is a lack of people able to teach how to hit properly and even fewer with any concept of how to avoid getting hit. (keeping your gloves up just ain't enough, unless you fight a man obliging enough to hit them instead of your nose)And how to move in a boxing ring...it is a lost art and nobody teaches it any more. The idea of skipping around the ring like Ali has just ruined it, if fighters move at all.