True is correct because selecting a synthetic voice that is not native to the language of your content can lead to unintended pronunciation or speech patterns.

Speech synthesis models are trained on language specific phonetics and prosody so a voice optimized for one language may render phonemes, stress, and intonation differently when used with another language. That mismatch often causes words and names to be pronounced incorrectly or to sound unnatural.

To reduce these problems choose a voice that matches the content language and locale and use available controls such as language tags and SSML phoneme or pronunciation features to correct troublesome words. It is also important to test short audio samples before deploying.

False is incorrect because it claims that choosing a non native voice does not affect pronunciation. In practice a mismatched voice will commonly alter phoneme interpretation and prosody and produce the unintended speech patterns that the question describes.

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