Black Cubans at the very least are the ancestors of people who survived the sugar plantations, hellish work that was notorious even back then (when common sailors experienced conditions worse than modern third world prisoners).
That’s not even getting into the eugenics argument, with plenty of artificial selection also going on in the Cuban slave populations like what happened in America.
With every muscle group thick and full It seems clear to me Romero’s amazing genetics were bred into his ancestors like a pedigree hound. Woodley, Lombard and randleman as well.
In the bodybuilding world we have the likes of Ronnie Coleman, Phil Heath, kai Greene, Lee Haney, Sergio Olivia, toney freeman (get it), that all likely are the result of African slave populations being bred for physical capacity.
Natural or not their genetics are still superior to many. Although islander genetics, lacking the effects of agriculture, farming and urbanisation can often be even more beastly (huge frames built to absorb and put out great force).