Global climate change and the all the plants and animals that have gone extinct makes Africa a different place than it was when hominids first evolved. And the population sizes were on entirely different magnitudes pre-agriculture. And even then, when they did start spreading, many of them starved or died from other things we would consider preventable in modern contexts.

So whether or not people are currently dealing with food insecurity in Africa has pretty much nothing to do with where humanity evolved from. The explanation for what is going on, even though we have agriculture and could feed everyone, is colonialism.