The game is using DLSS v3.1.1 Super Resolution SDK and DLSS v1.0.3 Frame Generation SDK.
"DLSS 3.1" is not a thing.
There's only "DLSS 3" - which is a marketing package containing DLSS SR, FG and Reflex SDKs. All three have their own versions which aren't at all related to the marketing name of "DLSS 3" tech.
It is a bit confusing.