I don't think that article was groundbreaking - both de Villiers and du Plessis have openly said as much in the past year. Its also one of the reasons why exceptionally good South African rugby players are migrating to France, England and Ireland in such numbers.
You can see the point - for international sport, selection has to be merit based. Its fine if you're "transformation" players are Tahir, Amla, Philander and Rabada - all test class. Its something rather different if you're having to pick, say, Phangiso over Harmer purely to meet a criteria. Its worse for the Springboks rugby side - they've been cosseted for years on the basis of having Habana, Pietersen and Mtawawira, but all three will be playing in Europe next year...and there is not the township talent coming through as yet...