It does not prove much of anything other than that one has to be aware of the rescaling effects when comparing today’s SAT scores to those you or others may have gotten in earlier generations.
It may also be relevant if you work in an industry where job applicants are asked for the SAT scores from high school even after they have long since graduated from college. Not accounting for the rescalings may result in age discrimination against older people whose SAT scores appear lower due to the rescalings.