I thought the South Africans confirmed that.
I thought they denied it.
You are both right.
ID’d (properly) as a nuclear weapon detonation, both nations denied any involvement.
About 20- years later, extensive regime change in South Africa led to the release of some records corroborating what the CIA told Jimmah Cahtah... Nuclear weapons test, South Africa had to be involved and that there was ‘credible’ evidence of Israeli involvement.
There has been no official statement of ‘yeah it was our nuke’ from either country, but the story changed from “NO, WE DID NOT!!!” to “no comment” in the mid-90’s among the sort of “common knowledge” that the two countries violated about 3 treaties each with this BS’ery...