What does "pre-recording/post-animating" mean? That they finalize the animation after the voice work is done?
Whereas it's standard to record voices before animation in the west, the opposite is standard in Japan. There are a few exceptions- Akira, for one, as well as the present day scenes of Takahata's Only Yesterday. He puts it to good use in the extended car conversation scenes, catching every pause and shift in the dialogue visually.