“Meta AI Translations uses the sound and tone of your own voice so it feels authentically you. And the lip syncing feature matches your mouth’s movements to the translated audio, so that it looks like you’re really speaking the language in the reel. You’re in full control of the entire experience, and can turn it on and off and review or remove translations at any time. ”
Source : Expanding Meta AI Translations for Creators on Facebook and Instagram | Facebook for Creators