increase in heat resistance isn't directly proportionate to power level, again hue goku has much less heat resistance than he does resistance to impact because he was hurt by the lava, so he doesn't have universe level heat resistance, we don't know if the moon was vaporized, we see a large amount of light that could have covered all the dust, and the dust was likely spread by the force of the impact, so it could have been pulverised, finally i know ki blasts have heat, anyone who watches the show knows that, you don't need to watch that episode to see ki blasts have cauterized wounds before, like when piccolo shot goku, there was no blood flow, and we see frieza's attack light trees on fire, arguement done, anime goku can die from nuke heat, especially because he can't submerge in 6000 degrees c, sorry for writing a novel, but i don't care