It is more a prestige question than a technical one. Every Region has RVSM and so Africa must have it.
As(too) many politicians and CAA managers in that part of the world only react to money ; more traffic with RSM ? = more overflight charges = good for me.
I know of many Sates ATC Control centres who did not have the training required , and no letters of agreements signed , or even discussed prior implementation today. Scary : no , after all it is the real world.