Red Dead Redemption on the Nintendo Switch, you can access an official free digital upgrade

New Controls:

Includes mouse-style aiming controls and improved responsiveness for horseback riding. Acquisition & eShop Details These NEW Switch 2 Updates Sound INSANE!

not a remaster

It is but a direct port of the original PS3/Xbox 360 version with improved performance and resolution.

Remember:

If a deal looks too good to be true on the eShop, it is. The only "free" update you need is the official 1.0.2 patch, which is automatically downloaded when you buy the game legally.