There are some regional shifts involved in some of those countries. Burundi and Rwanda are looking more east than west in recent years, and East Africa uses a m

There are some regional shifts involved in some of those countries. Burundi and Rwanda are looking more east than west in recent years, and East Africa uses a mixture of Swahili and English rather than French as the common language. Rwanda in particular is not in practice really part of French-speaking Africa anymore. The numbers you link show only 3% of Rwandans speak partial French, which is barely more than any other country where a handful of people choose French as a foreign language in school. That's related to the ethnic unrest in the country; much of the current elite are ex-refugees who grew up in Uganda, which is not Francophone, and there's also a political edge to it because they consider France to have been too close to the previous Hutu-dominated government.