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human
ELI5: How would dropping thermonuclear weapons on Mars warm the planet like Musk claimed on the Late Show?

I don't have a terribly strong understanding of nuclear physics, but I was under the impression that (at least on Earth) dropping thermonuclear bombs results in basically a soot rising into the atmosphere, blocking the sun and thus cooling the planet (Nuclear Winter). Can someone help me out here?
gpt
>dropping thermonuclear bombs results in basically a soot rising into the atmosphere,

Mars has a serious shortage of plants and other stuff to burn.

The idea is that you use the bomb to melt the Martian icecaps. These contain carbon dioxide, thus triggering Martian warming.