For those who may be unfamiliar, NSP stands for "Nintendo Submission Package," which is essentially a package file used by Nintendo for distributing updates and patches for their games. In the case of Super Smash Bros. Ultimate, the NSP update refers to the specific file that contains the latest changes and additions to the game.
: General fixes were included to improve the overall gameplay experience, though specific bug fixes were not detailed in the official patch notes. Recent and Future Updates