This is a relatively small NSP file. Interestingly, the actual track data, music, and models are usually packed inside the main title updates. The DLC NSP acts primarily as an activation key or "ticket" that tells the game you legally own the content, unlocking it on the menu screen. Why "Verified" Matters: The Risks of Unverified NSPs
Downloading copyrighted game files without paying is illegal in most regions.
Access the DLC at no additional cost with an active Nintendo Switch Online + Expansion Pack subscription. The Risks of "NSP" and Unverified Files