It really is. In modern context "evolution" doesn't mean "any type of evolution e.g. Lamarckian evolution, evolution from natural selection or Pokemon evolution from leveling up". It really just means "evolution from natural selection" which is not only a novel idea proposed by Darwin, but Darwin also pioneered to research on this idea (i.e. going around the world and collecting specimens that could potentially falsify his hypothesis but instead support it).

That Plato thought your mind transfers from your previous souls and this is called "evolution" is simply an accident of language.