You are right. I have no idea. I also have no idea how anyone would wait 37 years before coming forward with this accusation.
It smacks of #MeTooism.
I am only coming at this from this point of view. My cousins wife just passed of Cancer at a young age. He came across her diaries and discovered that she had been sexually abuses from 11 on for a couple of years. She kept the secret to the grave. So... one never knows. btw the abuser was recently presented with her diaries... Charges are pending.