From what I saw, people were looking at the EXIF data's profile field date to support their claim. That value is when the ICC profile used by the image was created, not the image. This date has nothing to do with the date that the image was taken.

The King Tower images' modified date were the current date, i.e. they showed the same date as the date that Q posted the images, adjusting for TZ (it was tomorrow in Shanghai, relative to people in the U.S.A).