Idk.
Using HDI [0] you can see that ZA was middle of the pack developmentally in the 90s, but platueaed until 2007, when the commodity boom and BRICS fervor saw ZA's development skyrocket. Yet by 2013 onwards, that development began to plateau again.
Furthermore, ZA is a country that is traditionally compared to other rising economies like China, Brazil, India, Malaysia, Mexico, Thailand, etc. In the 2000s, ZA was far ahead of China developmentally and comparable to Mexico and Brazil, yet all 3 countries have overtaken ZA.
Heck, in 1990 Malaysia, Thailand, and South Africa were all comparable developmentally yet Malaysia and Thailand in 2023 have hit the precipice of becoming a developed country (HDI at 0.8 and above) while South Africa is still stuck.
Even Vietnam, a country that in 1990 was one of the poorest countries in the world has now in 2023 caught up to South Africa developmentally.
This absolutely constitutes a collapse. Mind you it's not as bad as Venezuela's (China in 2023 has only just hit developmental indicators that Venezuela had in the late 2000s and early 2010s, yet Venezuela had regressed to the same level as China in the early 2000s), but it is absolutely a massive regression.
[0] - https://countryeconomy.com/hdi/south-africa