So would it be that the defense went public with it? I ask because it seems odd for such investigative material to be out in public. I did find a video on YT of GZ'a voice analysis session - day after the incident. That also shows him as completely straight forward.
In Florida a lot of this trial material once released by the prosecution to the defense must by law be made public. And this video and those voice analyses are among the things that were released.