Huh, Snow White (1937) was released 74 years after the death of Jacob Grimm (1863). Didn't Disney lobby for the extension of copyright to 70 years after the aut

Huh, Snow White (1937) was released 74 years after the death of Jacob Grimm (1863). Didn't Disney lobby for the extension of copyright to 70 years after the author's death? I wonder if that's why they decided on that number.