Not sure how close they are to the Bantu, but they'll be separate from us regardless.
None of the African tribes have any Neanderthal admixture (while we all do; last common ancestor ~250,000+ years), and all of them have admixture from ancient hominids like Homo Erectus (while none of us have any... we used to think they were an extinct branch until recently; last common ancestor 1,500,000+ years). That's why they are so far removed from us in PCA graphs (which is what you see in the OP).
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