Not quite my friend, the ult started bigger but the cast range was smaller so anivia would have to close in to actually land an E with Chill, the updated the range by 50 points to make it coincide with her AA and E range, it might not see like much but since half of anivia damage comes from her chill mechanic it basically means she can pull her combo from longer in case she misses her Q.
Also Chill during her ult was buffed, the E applies a normal Chill, but the ult applies a modified chill that increases the slow by up to an extra 20%, so if you are caught you either dash or your die since the slow is pretty much at Nasus Withered state at that point