Note : if you use Inspector to force DLSS DLLs overrides and presets globally, you have to redo it every time a driver is installed as it resets these settings.
If you set it per game (either in the NV App or Inspector), it will be kept, only the global DLSS overrides are reset on driver update.
Also, Inspector only does what the NV App does : it changes settings in the Registry, it just exposes more settings.
DLSS Swapper only swaps DLL files and can't force presets.