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Typically chatGPT yes, but it is not the reply it pretends to be, since GP admittedly concatenated the original post with undisclosed text of themselves to produce this output.

I bet GPT's dataset has a significant percentage of reddit data

>> after fiddling a bit with the prompt

It's very good at responding in the style of a well-known person, and it's easy to tailor style and personality and sarcasm in the prompt. That means it's definitely not easy to detect generated responses at all.