I think the point he's making is yes, we need more black businesses, but whether or not black people support it or white people do is irrelevant as long as they are making money. Arabs and Asians have no problem getting rich off of other races. The end result is still money coming into the black community as opposed to leaving it.
The whole buy black is good motto to go by individually but a bad marketing tactic for a black business, you want every bodies dollars. We need to focus on Hiring Black more than anything. The solution to this is black people making more money, not making more money off of black people.