LOL, I don't understand what they were thinking when writing this part. AI may be used, probably, in order to remove the watermark even right now, not one day,

LOL, I don't understand what they were thinking when writing this part. AI may be used, probably, in order to remove the watermark even right now, not one day, but recognizing the non uniform part, subtracting it and adding a different one. To create the training set of same-image taken with differnt-sensor is not hard.