Due to the Partial Nuclear Test Ban Treaty, the majority of bombs since 1962 were detonated underground to limit fallout dispersion.

Ok, so we have data only on about 300 above ground nuclear detonations, instead of 2,000. And those 300 included H-Bombs.

Also keep in mind that A-bombs like were dropped in Japan killed everyone within a 1 mile radius. Modern warheads are H-bombs which kill everyone in a 5-10 mile radius.

And how far from a large city do you think the suburbs spread? Yes, anyone near the city center has no chance. That was not disputed by anyone.

And if we want to be pedantic, a hardened underground bunker would probably have chances for survival quite a bit closer than 5-10 miles.