Bitcoin is already legalized in some Africa countries. I don't know the country that you are from, but my country has legalized the used of cryptocurrency, and Nigeria has the highest number of crypto daily users and adopters.
Nigeria, South Africa, Morocco, Ghana and Kenya and many more countries in Africa that bitcoin is legalized. It is not compulsory that the government must use it as a legal tender before, bitcoin can be used or is legal.
Obviously, op was not able to pass the information correctly because of his poor choice of words but s/he was referring to the adoption of Bitcoin as a legal tender in Africa.
Bitcoin is still in the grey area in most African countries. There's no law permitting or restricting the use of bitcoin except for few countries like Morocco, Tunisia, Algeria, Egypt where it is officially banned. With Bitcoin adoption rate increasing steadily, anything is possible and we may get to see an African country taking the bold step.