Actually Africans do care a whole lot about skin color. Nigerians lead the way when it comes to skin bleaching and Ghana isn’t that far behind.
Colorism is a real issue that shouldn’t be taken lightly — so when an opportunity presents itself whereby an actress decides to make way for talent that she considers more qualified for the role she’s up for — that could be seen as an act of bravery. But in this case — it’s important to point out that her need to make that statement wasn’t necessary when you consider that she could’ve easily been cast as an African — despite being biracial.
I don’t believe having only dark-skinned talent representing a fictional African nation is the ideal way to tackle colorism unless that is supposed to be the requirement for that particular story.