the party program doesn't state it, but some high figures were caught talking about it. E.g. Björn Höcke and Maximilian Krah. They did not mention "brown people" as gp states, but called out people foreign to the local culture.
Throwing out citizens because of some birth attribute they can not influence could be seen as inhumane.
Would you think it's ok to throw out everybody with a certain eye color?
But then it needs to be defined what is local culture and what is foreign. And people would need to get the same treatment independently of their background. That is not what the AfD argues.