ATC Watcher wonders:
Do you have any indication to confirm that statement ? Have there been previous ground incidents involving ATC that would explain your "knee-jerk" response ?
No, I don't have personal or first-hand knowledge of previous incidents, though there are indications in this thread that it's not the first time an aircraft has missed that turn.
My knee-jerk response is due to the general approach of civil and government authorities here (and I speak specifically of Johannesburg). There is widespread incompetence and buck-passing. I merely assume (knowing full well that all assumptions are dangerous) that the airport authorities are not immune from the general malaise.