the shape of this land is slowly changing and it's getting more and more defined, finally reaching the precision of the geographic atlases we are used to.
It's not just a question of drawings, it's the definition of a concept.
It could be interesting also to represent the evolution of the world map during the period of European explorations. but ok, this can give an idea at least.
and for those who would prefer to see how the slightly different shapes are not changing the concept of the general idea of Africa, take a look to this faster sequence: