Toba didn't have that impact.
The Toba keyword, (mostly) chrono sort:
It looks like the scientists are arguing over whether Toba had a strong influence of human survival. I have pulled up a pag of charts, many of which show world temperatures from 1/2 million years ago to present. Don’t get confused by the charts for the last 20,000 years. You will see in chart after chart that our most recent ice age started about 125,000 years ago. Then around 74,000 years ago they all take a sharp dip around 72,000 years ago and it takes a decade for the temperature to restore itself to the previous glide path.
Also thanks for all the references.