It seems more likely that they would be able to incinerate a city that pull off a high altitude detonation that would have this effect. More likely than that is that they’d get off a missile and that it’d miss its target or otherwise malfunction or be intercepted.
That said, I’m glad my remote bugout location is finished - unlimited water, well stocked on food and lots of hunting/fishing nearby, offgrid renewable power. Assuming that I can safely get to it, I’ll be set for a long time.
“Assuming that I can safely get to it, I’ll be set for a long time.”
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Just you and all the others that will be coming your way ... and those after them and so on ...