The chinese dude is definitely lulz. I do some similar work if the trailer is any representation. I'll just say my anecdotes probably don't contradict his very often.
Had it not been for WW1 and 2, I think Africa would be much better off atm. The de-colonization wave was more about downsizing empires than anything else, so infrastructure designed for export and interdependence with a farflung mother country was rarely suited well for trade with neighboring countries. Like all the railroads don't connect to the neighbors, or even necessarily to each other. They just go from plantations to the port. Often these African colonies produced similar goods as one another for export to Europe. Your neighbors making the same shit as you don't need to work with you. The whole economy just melted, and only a few were able to catch themselves before they fell over. Once the house of cards starts to go, it's easy to death-spiral. Hence the recent financial bailouts and depression era work programs.