In the case of Metal Gear 2: Solid Snake, the NSP update likely includes various improvements, bug fixes, and possibly new features. The update may also include compatibility with newer versions of the Nintendo Switch operating system.
Metal Gear 2: Solid Snake - A Legendary Game Gets an NSP Update** Metal Gear Metal Gear 2 Solid Snake -NSP--Upd...
For those unfamiliar with NSP files, they are a type of package file used by the Nintendo Switch to distribute and install games and other content. An NSP update typically involves releasing a new version of a game or application in NSP format, which can be easily installed on a Nintendo Switch. In the case of Metal Gear 2: Solid