I don't know.
Some people seem to think so, writing posts saying, "even if the pope said it, it was reckless to repeat it ..." while others are "stunned at the pastoral recklessness of such an assertion. Simply stunned." They are talking about what Cardinal Kasper has been saying in interviews of course.
I wonder what they would say about what Our Lady said?
Our Lady of Fatima told Blessed Jacinta, "Many marriages are not good; they do not please Our Lord and are not of God." That was nearly 100 years ago in Portugal. If it was that bad then, what is the state of marriage today?
Catholics don't have to believe that however - nor do they have to believe Cardinal Kasper repeating tales out of 'college' of what the Pope might have told him privately.
Of course, some people think Our Lady was reckless showing the children of Fatima a vision of hell.
Come to think of it - Pope Francis talks about the devil and hell too. I wonder if there is a connection?
Happy feast day!