Actually those DNA tests don't really tell people what they think that they are being told. The DNA tests given by these commercial companies only get samples in certain places like Nigeria, Ghana, Ivory Coast and Senegal in West Africa. Those testing companies don't typically get samples in places like Sierra Leone, Liberia, Guinea, Mauritania, Mali, Burkina Faso or Niger. On top of that they only take DNA samples from certain ethnic within those countries, like the Yoruba, Akan, Mandinka, etc.
Since those companies don't get DNA from all over West Africa and from all the ethnic groups, then they are not giving accurate results. Those tests are based off of less than 2,000 samples, so they just basically end up saying that your DNA looks similar to a particular region or group within a region; which does not mean that a person is from Nigeria. Case in point is this Cameroonian man that took a 23andme DNA tests, but since 23andme don't have samples for Cameroon; they assigned the man to Nigeria and Congo.
So African Americans taking these tests need to realize that those tests are not accurate because it is giving autosomal results that just assign your DNA to a region that matches it the closest. The African Ancestry DNA test is probably the most accurate, because they have over 33,000 samples from tribes all over Africa and they only test the X and Y chromosome. African Americans ancestors are from all over West Africa. Nigeria was not one of the places that most African Americans are from, because most slaves from Nigeria were taken to the Caribbean and South America. Most African American ancestors on the other hand are from the Rice Coast (Sengal, Gambia, Guinea-Bissau, Guinea Conakry and Sierra Leone), Windward Coast (Liberia and Ivory Coast), Upper Volta (Mali and Burkina), Gold Coast (modern day Ghana), Cameroon and Congo. Slaves were taken from Nigeria and brought to the USA, but not in nearly the volume that people think.
So Deontay Wilder may not have even been Nigerian, but since they don't test in places liker Upper Volta then he was probably just assigned to the Nigerian region.