Who's your adversary? Do you need to protect against your little brother, your boss, or Mossad finding out it's you?
In addition to the voice, do not forget to change your vocabulary and usage of certain phrases, words, and mannerisms.
Launch it, but don’t tell anyone else about it. Ever.
1. Follow all the technical and payment processing advice in that thread.
2. Mask your voice, change your vocabulary, don't talk about yourself or any other identifiable individuals.
3. Point 2 especially will ensure that no one ever listens to your podcast which provides the highest possible level of anonymity.