Did you miss the part of your own link that talked about the impact of aggressive lockdowns on Africa? You quoted it. Africa's low numbers are a combination of a lack of testing, swift lockdowns and experience with mitigation tactics, and age (partially caused by the high rate of other diseases, which has caused a lot of death for people that would be older). BTW, a lack of testing is part of what Florida is doing. While they have about 7k more cases per million people than California, they have run about 200k less tests per million people as well.