I saw this headline today. Well, if you tell me "you won't believe who Kevin Durant is dating"... that might be true. If I found out, for instance, that he was dating Theresa May, I would be very surprised.
But once you add in the word "reportedly," then statements of the class "You won't believe the X is reportedly dating Y" are false for all possible values of X and Y. If you tell me "Donald Trump is dating Beyoncé," I will find that very difficult to believe. But if you tell me that somewhere, someone is reporting that Donald Trump is dating Beyoncé, I will just shrug my shoulders, and say "Of course."