This was a trial balloon floated by black South African politicians want to make Afrikaners persona-non-grata and dispossess them, like they did in Zimbabwe.
If Afrikaan farmers want to leave, they'd have more luck emigrating to another British Commonwealth Dominion like Canada, Australia, New Zealand, etc. South America is also another option.
Elon Musk is 1/2 Afrikaner. His father is South African and his mother is Canadian.