Whatever they say. DLSS is a dll shipped with the game. Old games don"t automatically get an updated DLSS.

You can usually replace the dll in a game with newer ones and often get better quality.

Idk, maybe they ship some parts of DLSS in the driver, but games don’t use it automatically.

Having said that, Nvidia does ship game specific fixes in their driver. But it’s less “retrain ai” and more “fix what they fucked up”.