I see what you mean. I have heard accounts that the sumerian statues once were painted brown and know all ofa suden all of the statues are white.
Ipersonally don't know alot about the sumerians except what i have read of samuel noah cramer which was not all that convincing.
I cannot say those statues I have seen of sumerians are africoid at all. nefertiti on the other hand had family relatives that had tightly curled hair such as sequenre tao,and I know her father was egyptains and her mother pey was syrian so that is why all the mixed looks. I don't doubt that there has some foul play when i came to some artifacts,but sorry man i am not convinced the sumerians were africoid.