Where does the French accent come from in ChatGPT?

I'm fascinated that when I ask ChatGPT to speak French with English words embedded in the French, it stays in "French mode" and speaks the English words with what I recognize as a French accent for English. Does that accent come about as a happy byproduct of mapping English sounds into a French speech model -- that is, are "accents" just epiphenomena here? Or does ChatGPT actually have special accent handling?

I'm not sure what to make of the explanation that perplexity.ai gave in response to my musing. Is the answer correct?