Then I guess, I was guessing wrong? I'm not trying to claim anything and I did specify "there", because I did notice the Americas and Australia. I assumed, the definition of "native speaker" was maybe a bit special here...
My thinking was that South Africa might have had more immigrants from Europe and such than e.g. Congo. At least, I believe, South Africa is particularly known for having many white folks there. But yeah, I'm also just spitballing...