No they do not. African civs are white why would they bother changing mining mechanics? As a Native American I find it offensive that they would only change a native civ but not fix other ones for them to be more accurate (and with AoE3DE I found nothing offensive with the old mechanics, and I found it offensive that they changed it for North American natives, but NO other civs got special treatment for their ‘historical inaccuracies’).
If such changes were made for a DLC I would not buy it I know that much.
(this comment is in line with Code of Conduct Section B, Line 3, located here: Age of Empires Forum Code of Conduct and Terms of Service).