This video with Nissan marketing shows a 60kWh battery in the 2023.
Did they shave the battery in the new Leaf?
https://youtu.be/_Kp78NUWEBc
So, I guess Nissan tweaked the aerodynamics to perfectly offset the range loss that would otherwise result from a smaller battery pack.the shapes of the tire deflectors at all four corners, rear under diffuser and rear spoiler have all been modified for better aerodynamics.