Well, that's not a convincing argument because there could be many which are not. But you can't get around the fact that nothing can ever be cooked with a pulse of heat.
You are confusing the outer radius of an explosion which passes in an instant with the fireball expansion and collapse, which at least doubles, location dependant, the exposure of an object to heat. The metal could become super heated and radiate heat for some time.
the fireball travels up into a mushroom cloud and is not present at any location for more than a second either. No explosion leaves objects super heated like an oven. They get scorched on the outside and remain cool on the inside because nothing transmits heat instantly, and the fireball does not stick around long enough to heat anything.
The formation of the fireball/mushroom cloud displaces a wave of superheated air that expands for miles from the center of the blast. As this bubble cools, everything gets pulled towards the center and can form a firestorm. Generally the mushroom cloud isn't rising until after the thermal pulse and initial wave of displaced super heated air has reached its maximum spread from the hypocenter. Make no mistake that between the thermal pulse, pressure wave of super heated air, secondary fires, and firestorm the pizza is getting cooked.
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