This indicates that the repack includes multiple update layers (both 1.4.0 and 1.4.1) or is pre-patched to the latest version. This saves the user from having to install the base game and each update separately.
Three new themes (The Great Stage, The Dance Hall, and The Tomb Suites) with matching ghosts and outfits for Luigi. luigimansion3nspupdate14014140mu repack
Luigi’s Mansion 3: Understanding the v1.4.0 & v1.4.1 Updates for NSP and Repacks This indicates that the repack includes multiple update
The v1.4.0 update was the primary vehicle for the second wave of DLC. It added: The Dance Hall
Ensure your Switch system firmware is updated to a version compatible with the 1.4.x era (typically Firmware 10.0.0 or higher).