I was actually aware of the recent report from South Africa about the impact of the Toba explosion on African humans.
It was an interesting article, but in my opinion, reached sweeping generalized conclusions that were not supported by the evidence.
I probably should have said “some” scientists believed African humans were almost wiped out, instead of “many” scientists.
As I recall, the original theory was that homo sapiens in Africa may have been reduced to about 10,000 individuals.
The evidence for earlier out-migration of African humans gets stronger and stronger every year. There is pretty clear evidence for homo sapiens in Israel and the Caucasus region by 100,000 years ago, and probably before that.
I thought it was a very interesting coincidence that the huge Toba explosion occurred at almost exactly the same point in time that a wandering star passed through the Ort Cloud.