The 'truth' is he can talk, but the Iranian leaders are avid students of the ancient chinese book, "The Art of War". Talk, negotiate with your enemy get a lot but give little. The Iranians position is they will make atomic bombs, this point is not negotiatable. They will cede many non important points to bide time and the negotiators of the west go back home bragging about what all Iran has given up. Which amounts to nothing.
The west has never had decent negotiators.