Are you asking me to trust that a video clip posted to the ChatGPT subreddit by u/SWAMPMONK is providing an accurate audio recording of the openAI sky voice?
You can literally go look up the original demo footage on YouTube too. Which is what I did (before that comparison was created) and didn't think it sounded anything like SJ.
Put side by side...I can hear a similarity, but they're also distinctly different (the OAI voice doesn't have the huskiness of the Her VA IMO, but they're both Californian female with a bubbly demeanour).