I lived and worked there in the late 70s (based in Yeoville neighborhood of JoBurg). It had a vibrant Litvish community with Kollel then.
The country fell apart after the ANC took power and whites fled in droves.
I have been back a number of times, last in 2019, not much to attract young families. Those who can find suitable economic situations abroad, leave. Not just Jews, but whites in general.