This is a quote from a screed called AMERICAN: A DISTINCT RACE AND ENDANGERED SPECIE VOLUME ONE 

by : Minister Antonio "Tomahawk Tony" Lorenzo 

page 205

The author of this book belongs to a community that calls itself "Aborigine Americans". They believe that very dark-skinned people who most of the world would recognize as African-descent were actually the original inhabitants of the Americas, and that the Native people that the rest of the world recognizes as the First Nations of these continents are nothing but straight-haired, Mongoloid immigrants from Asian Siberia that arrived more recently and found the so-called coppered-colored and tightly-curled haired "Aborigine Americans" already here several centuries before the eventual arrival of Europeans.. They reject the proven historical narrative that Black people were brought to the Americas as slaves from Africa by Europeans and vehemently reject the ethnic identification of "African American". They are obsessed with the "purity" of the so-called "Aborigine American" race and the belief that so-called Aborigine Americans should not, or can not attempt to mix racially with any other race, including people of African ancestry.

This is the quote:

"The Scientific Rejection of Racial Mixing Claims
As previously stated, there is no scientific or biological evidence to support the
claim that Aboriginal Americans and Africans were, or could be, naturally mixed.
This assertion is a colonial fabrication meant to serve political and economic
interests, not one grounded in genetic or anthropological truth. Americans of the 
Americas, including the American Race & Specie, have distinct genetic lineages
that have evolved separately from those of Africans, Europeans, and other foreign groups. These distinct genetic markers are a testament to their autochthonous status, having been part of the Americas for thousands of years, long before any external groups arrived.
The lack of biological evidence for these claims of miscegenation underscores the
deliberate nature of the colonial fraud. The American Race & Specie is not
genetically compatible with foreign species in ways that would allow for the
natural procreation of mixed offspring. Any such claims are based on lies,"