They are not distributing components of the dll. They are creating a modification of a Bethesda game which has allowed modding at the discretion of Bethesda.

The Nvidia dll is being redistributed without modification for an Nvidia GPU as exactly described.

Do you think every single game publisher negotiated a deal or paid money to ensure DLSS in their game? Can you point out any documentation outside of the direct reference to the SDK license that I linked that is in direct opposition to what your are saying? Can you point to me any discussion what so ever about paying to implement DLSS?