This file constitutes copyright infringement. Downloading or distributing ROMs or updates for games you do not own is illegal in most jurisdictions.
The filename itself provides significant insight into the potential threat: batmanarkhamcitynspupdate101romslabrar updated
If you use a hacked Switch to play pirated NSPs, even in airplane mode, Nintendo’s telemetry can detect mismatched title IDs or missing purchase records. The console will be permanently banned from the eShop, online play, and game updates – turning your Switch into a single-player-only device. This file constitutes copyright infringement