The correct answer is Maybe because the Penance Stare is involved in many iterations that change whatever it does. If we go by the most common, the fact of the penance stare working only if the target feels guilt, then it won't work.
Although if we follow the original iteration, we got the Penance Stare that does harm an Omnimalevolent Being because it burns them with all the pain, guilt, despair, and madness that their victims underwent. All of it is being converted to spiritual flames that bring on spiritual harm that is not dependent on the guilt of the adversary.
Edit: Grammar.