Very Interesting... Maybe as a Pakastani National The South African Government has decided that he has all the information they need to give him.....or the rest of his family.
And just maybe as to the flight they might have decided that you and I and most others, dont have a "Need to Know" about how they operate......
Could be that ATC also feels you may not have a need to know about the flight... Those things do happen you know.....
Your post sounds as if you are throwing out the question without in fact contacting someone within the ATC system..
There are things in all governments that some of us at the lower end of the food chain should not be privy too.
What do you think??