I think that's an erroneous contention. Hopefully it was a mistake and not intentional. Rather than a 180 degree reversal, Spitzer has merely softened his position and conceded that it may, in some limited cases with highly motivated subjects, be possible to change their orientation.
But if he concluded that based on the research methodology desribed above, it's also highly likely that he was relying on very faulty data in coming to that conclusion.