They made the test easier, and they added a hundred or more points to every score. That’s why there are so many more “perfect” scores these days than there were in the 80s; it was incredibly rare then to achieve a 1600, almost unknown. Now scores that would have been in the mid-1400s are “perfect.”
At the high end of SAT performers, it probably doesn’t make much difference in terms of their overall college success, but the changes to testing and scoring serve to disguise how much the content level of secondary schooling has been diminished.