I don’t see that - in the first example he’s saying different races existed in prehistory on the American continent. (Well “prehistoric” and “before Columbus” which seem pretty far apart. But regardless) I’m not seeing what the racism is there -? I could just be stupid, but it doesn’t seem to be proclaiming the superiority of one race over another?
In the second example, he’s talking about Quetzalcoatl which has several interpretations as being a white man - whether that was the Spanish creating a myth or not, it’s been a common one. And, again, it’s not one he made up so not sure how that makes him racist.
Here’s the titles of his first seven books:
Non-Fiction Books In Publication Order
Africa Guide 1980 (1979)
Gulf Guide and Diary 1981 (1980)
Journey Through Pakistan (With: Mohamed Amin) (1982)
Ethiopia (1985)
AIDS (1986)
Lords of Poverty (1989)
African Ark (With: Carol Beckwith) (1990)
I just don’t buy that he’s racist, but open to new info.
As for the “there’s no evidence of agriculture” I’d guess that he’d say the many cataclysmic changes coincident with the last ice age may have wiped them out. (That’s a guess, I don’t know what he’d actually say.). The discovery of Gobekli Tepe does put a pretty robust culture in that time frame, in the are of modern Turkiye but that’s a very recent discovery.