I can think of a couple of issues which might underlie the economic issues of South Africa and Russia: namely thee end of one party rule in both states.
There really was no 'collapse' of the South African economy - it's been growing rapidly since the end of apartheid. Just some chaos during the transition. Crime expanded quite a lot and it had nothing to do with 'neoliberalism'.
And both nations would have had to go a heavy and chaotic transitionary period.
To imply that it was part of some cabal of Western Imperialist 'Doctrine' is completely false.
There were a lot of resources up for grabs - and a lot of money ploughing in.
Naomi Klein is part of the reason I dropped supporting SJW/leftist causes by default, I'm pretty skeptical these days, I pick and chose.
There was a dramatic downturn in the South African economy after 1994, not a collapse like Russia but our industry took a huge knock, the Rand weaken dramatically, there was vast disinvestment and job losses. Yes there was growth, but like all neoliberal regimes it has gone to the wealthiest 1%. Today South Africa is significantly worse in most social indicators than it was in 1994.