I've seen this before, and after the first time seeing it I wondered why is everybody talking about the Cold War, when 516 (+1 unknown) of them were atmospheric tests? And IIRC every single one of them stronger than Hiroshima and Nagasaki.
The deaths by those tests were negligible, compared to the expected deaths in a hot war. Just compare the millions of fatalities in Korea, Afghanistan or Vietnam. Those wars were only stand-ins for the real big one that thankfully never came.
Seems rather HOT to me.