Most Switch updates for this title are labeled v1.0.1 . There is no major v2.0.0 or DLC update, as the game’s DLC included a costume pack that was already bundled into the Switch release.
If you are sailing the high seas of Switch modding, the update is a "nice to have" but not required for the full comedic experience. Focus your attention on the base NSP first, and only grab the update if you find a verified, region-matched copy. south park the stick of truth switch nsp update