When us Africans refer to something as African, it can mean several things. Allow me to call it a FUBU approach. That means "For Us, By Us". It can also mean "For Us or By Us"
This means the entity does not necessarily have to be of African origin, it can just be a result of its focus on Africa. Jumia operates exclusively in Africa, and by virtue of that and our Ubuntu mentality, it is for all intents and purposes, one of us. Though not officially.
When Africans supported the French soccer team last year at the World Cup as "our African team", do you really think Africans are not aware that France is not in Africa and was not representing Africa either. It's just a social construct that gives us something to cheer about, historically we haven't had much.
The same FUBU mentality is also why a lot of Africans considered non-Africans "African heroes". Where I come from, Fidel Castro is an African hero for educating our doctors for free and sending doctors of their own. It's not because he is African. It is simply because of FUBU and Ubuntu.