An (Nintendo Submission Package) is essentially a container. Inside that container are several NCA (Nintendo Content Archive) files. These include: Program NCA: The actual game code. Control NCA: The icon, game title, and developer info. Legal/Manual NCAs: Metadata and instructions.
90% of the time, this error occurs because you are trying to install a game that requires a higher firmware version than your current file supports. If your keys were dumped when your Switch was on Firmware 12.0, but the game requires 17.0, the installer cannot "unlock" the NCA to see that it is a ProgramType. How to fix it: the nsp file is missing a programtype nca fix
If a major AAA game is only 100MB, the Program NCA is definitely missing. An (Nintendo Submission Package) is essentially a container
How to Fix "The NSP File is Missing a ProgramType NCA" Error Control NCA: The icon, game title, and developer info