Europeans believed Africans to be a sub species. you say, Stranded and I totally agree with you.
And that is sadly the opinion of many in 2020, laws, rules and staue removal wont change that, in fact it could reinforce racism.
You state "Centuries were spent justifying chattel slavery on racial grounds. “Scientific racism”. To deny it was racial is a historical revisionism" thats still happening but claim could be made by those in denial that its not revisionism but alternative understanding.
"Tribes would sell people in exchange for guns. It was white Europeans who created that market though".
Not completely true, many other European luxuries were traded but whatever you call them its still currency which is all money is.
And the Europeans created the market but it is Africans who controlled it and perpetuated it, they could have cut off supply but chose not to..... just as is happening with the likes of Primark and the Indian subcontinent clothing manufacturing business.