Well I just dont think there is any malice involved. Considering the population of Germany there actually is quite some diversity in the modern theme with different races. Sure there is room for some improvement but personly I find there are more important things to adress such as gender stereotypes.
Having a black and a chinese princess in a castle so pink that you get diabetes just by looking at it would be no substitute for having say, a colorfull Indian palace in a gender neutral theme with various indian princesses along with elephants, gardens, soldiers, tigers, marketstands and maybe some traders.