So as I was typing Sias Odendal into the google search bar, and a "Sias Odendaal" came up instead,
it wouldn't surprise me if he added one more "a" to his name to distance himself from the movie for 20 years until now.
But I found a facebook account and a photo:
is this the face of the man who wrote and directed Nukie?
That is most likely him: 'Odendaal' is a very common South African name and I think they removed an a from his name to make it more international. Remember that South Africa was the outhouse of the world back then.
I spoke to Sias once, way back but I have never met the man. I have a pic of him from 1970, a tall skinny bugger sitting in a car's boot / trunk holding a camera.