It is almost IMPOSSIBLE for people to get out of RSA and has been difficult for many decades.So please stop posting about something you know almost nothing at all about.
I doubt that S.A. has any significant border control. The problem seems to be the mistaken hope that the assets of white S.A. can be saved. My great uncle’s family had the same hope for their business in Poland before WWII. A thousand days they could have walked right out and found asylum but could not take their machines or tools with them.