AI not getting the nuance of the phrase.

“And the fact that the phrase “it’s cold as hell” exists and is used colloquially adds nuance to this idea. Syntactically and semantically, the phrase makes sense: it is an extreme feeling of one of the two ends of the temperature spectrum. However, cold and hell are two words that are oxymorons and are unable to work together in a sentence and yet, they do.” - https://voices.uchicago.edu/witnessingmedievalevil/2022/03/13/its-cold-as-hell/

cold as hell≈cold hearted; it's not a reference to temperature per Dante's Inferno.

When pronounced correctly both are the same.