Decolonization does not require sending settlers back to their country of origin and implying it does feeds into settler myths about decolonization. It requires the upending of the settler-colonial state structure.
The cool thing though is that settlers will take care of themselves and leave once they lose their privileged status. I'm thinking specifically of South Africa where once apartheid ended, many white South Africans left the country of their own volition. In fact many went to Israel, which makes special exceptions to grant citizenship for white South Africans that convert to Judaism.