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that's similar to the reasoning i used to defend hulk. hulk generates energy internally, and supes's source is external, but i'd have thought the latent energy in his cells would be enough to enable him to break free, as you showed. in both cases, it seems the energy inside them might act as a buffer, sort of, that would allow them to combat it initially, or perhaps in hulk's case, to build up IN SPITE of the temp.
i think in superman's case, he would have to break out before all his cells were completely robbed of their energy. hence, i think he would break out first. i think hulk COULD actually be frozen, but that he would simply continue to generate energy from within that would let him break free.
of course, the ice wouldn't block the sun, so superman would continue to generate energy at well, but i don't think he'd be able to break free if he were frozen, as hulk would. if any of that makes sense. lol