Yes, indeed. Africa was just as responsible for the slave trade as anyone else - they were the selling their own slaves - they owned other Africans as slaves and also owned many whites as slaves.
Slavery is and was evil - that should be a universal truth - but apparently, it isn’t actually evil to these people, but something to be used as a narrative.
https://historynewsnetwork.org/article/41431
A nice brief summary.