You didn't read whole the article trying to be cool, scroll down to the part about jazz breh eating it 20 years before those dudes were CREDITED with the invention...
His claims are still dubious.
Even so, based off of the article, it doesn't appear that black slaves had anything to do with the sandwich which originally comprised of french bread and boiled or fried oysters.
The pulled pork/brisket situation is still murky.
BBQ itself is an influence of african, spanish (barbacoa) and native influences.