As of build #6,395 the 2 inter-changeable DLSS Models within the game's graphics options are both currently using transformer model preset letters (K, and J), which leads to both options giving a performance decrease rather than the intended increase of a CNN preset.A user workaround right now is utilizing Nvidia Driver overrides (Requires 572.16 or higher) via the Nvidia App. Nvidia Support thread for forcing preset letters, I recommend to force Preset E which is a CNN model.
In conclusion, either change the preset letter that the "CNN" toggle in the game's settings that uses a preset that's properly on a CNN model, or giving players the option to choose which preset letter (Ex: Escape From Tarkov).
Ref:DLSS Model Preset Letters