meh.
Umar considers biracials to be black, so they kind of got him at the part where they said they are not committing financial treason since their money will go to their "black" children. so he was force to agree there. he could have easily flipped that by saying, most mulattos end up dating and marrying white people, so their money still ends up in the hand of their white grandchildren and back to the white community. but because he believes that mulattoss are black, he kind of forced himself in a corner. that's why he kept focusing only on the money being in joint with a white woman.
he kind of took a L there.