It's from 4 years ago so I assume the quality could be much better, but it still feels a lot less natural than to talk with a "gendered" voice.
I also don't really understand the problem of having only gendered voices. It's not YOUR voice, GPT-4 isn't speaking in your place, it's another entity that has its own voice.
Do you ask people to speak with a gender neutral voice? If not how is that different?