Privacy is the ability for an individual or group to seclude themselves or information about themselves, and thereby express themselves selectively.
If you want to be really strict, both your voice and the words you choose could give you away. Ideally you would let AI rewrite your text and also voice it with AI, so there is no link to you. Then still that doesn't protect you from accidental OPSEC failures, but that is always a given.
Perhaps this isn't an issue today, but everything is being stored and might become an issue in the future.
That’s a good point. Word choice would be quite low quality evidence prone to a high error rate, thus unsuitable as direct evidence, but it’s perhaps sufficient to get someone (if not the wrong person) on the radar for targeted surveillance. While voice prints are a sufficiently high quality biometric that banks are trusting them for identification purposes.
In any case, voice disguising should be an obligatory minimum whenever someone speaks to journalists on the condition of anonymity.