I suppose it depends on the intentions of those trying to typecast Africans. Notice that those who claim Igbos, Bini, etc have to be mixed race have a nefarious agenda. Debunking the myth removes some of the supporet for their shytty arguments.
Are you... like ... a crazy person? I realise that there's a certain amount of irony involved in asking a crazy person if they are in fact crazy, but what the fukk? Anyway, starting from the bottom quote.
Picture of Australian Aborigine:
Notice the hair? This is of course ignoring the fact that Australian Aborigines are genetically more distant to Black Africans than Sri Lankans. Perhaps your worldview on racial classification is warped and wrong?
Second, many parts of the Middle East are hotter than regions in Africa, including Nigeria. That hasn't resulted in the Arabs turning "black", so, perhaps there may be more at play than your po-dog understanding of genetics. Bear in mind that outside of the North, many (most?) parts of Nigeria are temperate. Also, several of the neighbours of the Igbos have a high number of their members that are in fact, a lighter shade of Black. Edo people, Ijaws, Urhobo, etc. Basically, you know nothing about Nigeria.
Finally, it'd be nice if you didn't try to imply that the Igbos aren't truly African or Nigerian. IT's implicit in the way you've couched your remarks about their supposed difference from their neighbours. There's no evidence to suggest there has been a genetic change caused by a party external to Africa.