Indeed rates are high and low, comparatively. And yet, all the "rates" are lost when compared to the average death rate for a society / nation / people. In that frame, "Covid death rates" are indeed small throughout. It is amusing that, even so, the "rate" for the US is so much higher than South Africa in particular and sub-Saharan Africa in general.
I place this all within the larger frame of the thread, "Medical ‘experts’ struggle to explain...." For almost three years beginning with those few Chinese videos showing people simply dropping dead in the street, we have see "medical experts" say so much. And now they struggle? :)

Also higher median age, but much lower than the US:

Higher cumulative death rate than most of Africa, but much lower than US:
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So, SA is a bit less like the rest of sub-Saharan Africa, and a wee bit more like the US. It's more developed than the rest of sub-Saharan Africa, but less developed than the US.
This article is mostly just a rehash of that article that was repeatedly posted here on FR last year. The headline is clickbaitish. "Experts" were and are not "mystified" or "confused". They find it interesting and are curious about it, and have offered various plausible theories.
And the article makes a wrong assumption here: "I have yet to see an establishment source mention the high rate of use of Ivermectin in Africa to fight parasites as a possible source of protection against Covid infection or severity."
As I have proven, there is not a "high rate of use of ivermectin in Africa". In those areas where it is used to combat river blindness and/or elephantiasis, it is taken once, sometimes twice per year, and then only a single dose, sometimes a five-day course for river blindness. There is no correlation between the areas where ivermectin is taken and Covid deaths or severity at all. When used for roundworms, it's a single dose one-and-done deal.
I know many here on FR really believe in ivermectin, but one has to look elsewhere for proof it actually works. Africa ain't it.