At the risk of slaughtering sacred cows and beating dead horses, anyone fished these venues?

At quick internet search returns references from Dean Riphagen's "Stillwater Trout in South Africa" and an article in "Fly Fishing Magazine", both of which hint at outstanding fishing, and absolutely zero further information ... which obviously peeked my curiosity.

Why so little information? Fishing so bad its not worth talking about? So good no one who fishes there can ever mentioned it again? Some web sleuthing leads to to the below area off the R617, getting warm? way of base? Whats the deal with the information blackout? Anything to do with the recent elitist snob thread?