Sometimes appeals are needed but that's getting far too into the picky details of the court system. And if the evidence was wrong somehow it's probably not going to get fixed: justice is wrong sometimes and the only solution is to never jail anyone, that is not a debate for this conversation.

Anyway torture, simply defined, is an act causing extreme pain in someone. And not just for five seconds. Hanging-done-wrong can be torture. Many ways of killing someone are torture. But the fast methods are not. Tell me your definition if it can somehow apply to the use of a guillotine.