I have it like that too. Africans did not have the know-how to make cast Iron pots.
As far as I know, the Bantu were still using Iron Age tech when they met the European, who was at that stage already in the Early Modern era.
This means that the European were, at the very least, a 1000-1500 years ahead of the Bantu in regards to tech and development.
This is why I asked
@ForceFate "what traditional" pots he is referring to as it could be traditional European pots made out of iron, or the traditional African pots, that was made out of clay.