The point is that it seems highly unlikely that Lula does NOT have traceable "black" ancestry. This is important given the fact that Brazil is now letting its citizens without SSA phenotypes declare themselves "black" for affirmative action purposes.
Which is why AA, as is applied, is not really realistic in Brazil. Some one can say they are "black" to get preferential access to college, and then revert to being "white" once they graduate. These "opportunitistic blacks" will be seen as and treated on the basis of their appearance, "white", regardless as to what their ancestry might be.
So AA might not help those who might truly need it. People who are unambiguously of part African appearance. This being subtly used against them in obtaining prestige positions in the corporate world.