I believe the papal charism extends to leadership of the Catholic Church but not necessarily to the gift of interpreting what is or is not "authentic" Islam. I'm not sure that the papal teaching ministry extends that far. That the Pope felt moved to inform us and instruct us on this matter in an apostolic exhortation would seem to indicate that he believes it does extend that far, at least in his own ministry. This leads me to think that both imprudence and dare I say it....pride .....may be factors which guide some of his words.
"Pride" may seem a strange word to use for a man which the MSM loves to portray as being as humble as a church mouse but I'm beginning to wonder in light of this and some of his other actions.
I'm prepared to listen to him when he talks on matters Catholic but I'm unconvinced that he's an arbiter and judge of "authentic" Islam. That's overreach in the first degree.
To promote the idea in an apostolic exhortation that "authentic Islam and the proper reading of the Koran are opposed to every form of violence” when such a claim flies in the face of the evidence seems to indicate that he is either willing to deliberately subjugate reality in his public communications in pursuit of ecumenism or that he is operating from an egological construct of reality in regard to Islam without reference to the big picture. So whatever the motivation for such a peculiar statement regarding Islam might be, it's hard to rationalize it as being a positive one.