The problem with deciding that you're going to destabilise African nations with a pandemic is that African nations erupt into bloody civil wars and outright genocides on terrifyingly little provocation.
You will recall that one of the great fears expressed in the last major Ebola outbreak was that widespread infection in Liberia would render the government incapable of dealing with the expected mass civil disorder. The major factor that has ensured a quiet level of Ebola infection rumbling along in west Africa for decades is that the major infective reserve is in the fucking DRC. It has not been possible to ensure consistent safe access to the areas of interest as Ebola reserves for international/western teams over the past few decades because DRC is a hellscape of warlords, machetes, genocide, mass rape and mass refugee flight. You may not be familiar with such places as Kivu and Yumbi: that's because genocide is such a common occurrence in the DRC that no one in the west really bothers to report on it any more. Almost 6 million people died in the five years of the Second Congo War, and I'm not sure the majority of random punters are aware there was a Second Congo War. One of the major local influences is the sort-of-sometimes-invading Rwandan army, and what is Rwanda most known for? A genocide where a million people died in weeks, neighbour murdering neighbour.
You introduce a 'destabilising' infective agent into west and central Africa, and the place will go up like a fucking tinderbox. A tinderbox with huge tracts of land, hostile terrain, and limited infrastructure for you to fall back and defend. A tinderbox of complicated tribal conflicts, warlords on the make, and cultural views about disease transmission that include fucking witchcraft as a major cause of disease.
The last fucking thing you would want to do if you wanted to improve and expand your influence in Africa is unleash plague in it. That's a good way to end up with your ears strung round the neck of a child soldier. The last way you would try to manage Africa is by subjecting it to more chaotic and unpredictable forces.