Wikipedia is not a determinative source.

Which answer is the "superrational" one in Newcomb's problem? In a game of chicken? In an ultimatum game?

Decision theories like Causal Decision Theory and Evidential Decision theory have answers, and can explain why they reached those answers. As far as I am aware, there's no equivalent formalization of "superrationality." Until such a formalization exists, it is misleading in this type of discussion to call "superrationality" a decision theory.