If you read the comment chain they swapped the originally uploaded image to swap to the non AI version, and parent comments are asking about the originally posted image, which is the reference. You asked “how do you know it’s AI?” about commenters asking about the originally posted image. I answered
Google and OpenAI (ChatGPT) watermark their ai generated images. You can read more at https://synthid.com/
Yes but that’s not what they used
If you read the comment chain they swapped the originally uploaded image to swap to the non AI version, and parent comments are asking about the originally posted image, which is the reference. You asked “how do you know it’s AI?” about commenters asking about the originally posted image. I answered