that might have been released by the community around that time?

For those still playing on the standard Nintendo Switch or Switch Lite: Review - Red Dead Redemption (Switch) - WayTooManyGames

For those looking for the legitimate experience, the game is now fully available on the platform with significant official updates that have improved the experience far beyond what was possible in 2021. Official Release and Major Updates

The official release of on the Nintendo Switch occurred on August 17, 2023 . In 2021, the game was not officially available on the platform, and any "NSP update" files from that year were likely illegitimate or based on unverified community rumors.

The original RDR port dropped on Switch in (not to be confused with the 2023 re-release/anniversary edition). The final update that year was v1.0.2 (title ID: 010078501A2A2000). Here's what it included:

There is no official update for Red Dead Redemption on Nintendo Switch from 2021, as the game was not released on the platform until August 17, 2023

An Analysis of the 2021 Red Dead Redemption Update on Nintendo Switch: A New Era for the Western Classic