Super Human was hyperbole, its the internet...
Trust me i have been around professional athletes for more than a decade.
I could dunk in middle school and my redshirt season in college i could dunk from the foul line before i started lifting weights.
I still have a bunch of friends from UM in the NFL, i knew Sean Taylor before he got killed.
I lived with world class athletes for years in my my 20's.....
People can work out as hard as they wan't but without natural size strength or insane speed and quickness they wont play pro.
I only say this because of your comment in bold, i know plenty of dudes like that.
Of course some people have genetic advantages over other people, and depending on your genetics you may be more apt to excel at certain sports. Black people are more likely than other ethnic groups to have some traits that may help to excel in certain sports. Other groups may have advantages that help them excel in other sports. Point is -
1. None of this has anything to do with weak ass eugenics attempts by slavemasters and everything to do with preexisting genetics
2. This does not in any way explain black dominance in popular athletics. The average genetic differences between, for example, black people and white people are not even close to being big enough to account for 78% of NBA players being black.