I think the article is pointing out that a lot of money leaves Africa via, directly and indirectly, corruption and transfer pricing. Openly stating these facts

I think the article is pointing out that a lot of money leaves Africa via, directly and indirectly, corruption and transfer pricing. Openly stating these facts isn't putting Africa down, it's highlighting a problem that needs to be fixed. OECD nations also suffer from these as well; corruption less so, but they also suffer from transfer pricing, this is why there is the push to reform taxation laws.