NIAC is rightly skeptical:

Supreme Leader Ayatollah Ali Khamenei pardoned 81 of some 530 political prisoners jailed in the wake of the 2009 presidential election....Speculation still surrounds today’s pardons with the Associated Press writing that “the pardons were seen as a gesture of good will by Iran’s leaders just days before the anniversary of the June 12 election.” However, some remain skeptical finding it hard to believe that Khamenei would have been motivated by a sudden change of heart to express good will towards a group of people he has spent the last year repressing. A far more likely explanation would be that the pardons are part of an effort to shift domestic and international attention away from the regime’s many human rights violations in the days nearing the anniversary of the 2009 election.