Bill Gates sold rights to the Tiananmen 1989 pictures to a Chinese company

Not in this case. At the time the photo was taken a work for hire (which as a wire photo I assume it is) had a copyright term of 75 years. If you wanted to roll the law back to before the Copyright Act of 1976 the photo would’ve had a 28 year term that could be renewed with a second term for a total of 52 years. To get a total copyright term of less than the photo’s age of 28 years you’d have to go back to the early 19th century, and I haven’t seen anyone seriously argue for that.