A lot of those farmers were welcomed into Zambia, and were doing quite well, perhaps that explains the change of heart.
Mozambique has opened their gates to departing Rhodesian and South African whites as well.
Ironically, prior to the Lancaster House talks of 1979, the socialist leaders of both Zambia and Mozambique (Kenneth Kaunda and Samora Machel) had told Mugabe not to alienate his white population, because they had each learned the hard way how important they were to the economy.