I disagree with Feser.
No fair judge would allow the question.
Neither is Pope Francis in the dock

.
If anyone is in the dock now I suggest it is Cardinal Bourke who is no longer following traditional polite procedures but playing to the lay gallery…and succeeding to some extent with the disaffected.
Yes, it would be good if the Pope could find some way to allay the Cardinals concerns. But if he chooses to do so privately or in ways outside of the Cardinals expectations that is surely his prerogative.
Personally I see Cardinal Bourke as seeing no answer other than agreement with his world view so no response agin his view will ever satisfy.
Silence therefore is itself a response, and indeed the most polite one possible in the circumstances.
Jesus did exactly the same in the face of his set opponents when writing in the sand.