This was a framework that both Google and Apple were working on globally to ensure privacy was protected. All that was left was for each country to put their own top level app in place to use it. So the privacy was built in by Apple and Google at the base layers to ensure no-one else will know who they were actually in contact with, but the app will be able to alert affected people.
There was a lot of panic about this framework initially but privacy experts had subsequently picked it apart to understand its inner workings and had declared it to be as privacy respecting as possible.
See Official COVID-19 tracing app launched in South Africa
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The COVID-19 Alert SA app lets people know when they have been in close contact with someone who has tested positive for COVID-19, and is available to anyone in South Africa who has a Bluetooth-enabled smartphone.