Notice they're immediately portraying the African population boom as inherently negative even by begrudgingly admitting that it is in line with the quick economic growth seen in the continent.
An example of the wonders this will have in Africa is simple actually. Botswana is one of the more resource rich nations when compared to its population. Aids affects it heavily atm. But a new gen of children born safe, and healthy will greatly diminish their rates along with their ability to quarantine the disease. Now you have a new gen of educated, well-fed kids who can sustain future populations and continue economic growth. A once impoverished nation can become developed within a mere generation if even that.
The key to success has always been population sustainability. The world is hella scared of a young Africa. Youth can't be deceived as readily as seniors born without education.
Africa can readily sustain 4 billion people.