1. Post where it says he can withstand absolute zero and then post an instance of him being frozen by something less.
2. Hulk being able to withstand absolute zero just means that he can survive absolute zero. It doesn't mean he won't be frozen by it, just that it won't kill him.
3. Just because one characters feats don't match their bios, doesn't mean everybody else's are untrue.
4. A bio is accurate and fair evidence unless contradicted by a different on panel feat. In your Hulk example, or any other example, IF it was contradicted then it means that statement in his bio has a little less weight. The same cannot be said about Sentry's bio. It was never once contradicted.
@underfire47: Sentry, in his official Marvel bio, is stated to vary in power dependent on his mental state. And his mental state was clearly depicted as deteriorated during his WWH fight. So yes, he was weakened.
Mental issues don't just go away in three panels. If you can't acknowledge that, then I have nothing else for you.