[Daniel II]

Ah ... now that makes sense. But it’s not how the article was writen. Went to wiki. They say 100 million megatons, too.

[Daniel II]

written ... whatever.

[LibWhacker]

Yes, 100 million megatons is the estimate most scientists currently put on that event. So there's no disagreement between this article and Wiki on that score. That's enough for (approximately) one Hiroshima-sized bomb for every man, woman and child on Earth. That is,

10¹⁴/(2x10⁴) = 5 x 10⁹.

More if you use 12.5 kilotons for Hiroshima. Or perhaps this talk was 10 years ago and Hawking was using 20 kilotons for Hiroshima. I've always heard 20 kilotons. In any event, way more than 10,000.