Im sure Luthier said that nvidia were onboard, not that it matters you can create your own profile you dont need to have a predifined one, but from what I have read in doing this there is little gain if any, so it suggests that SLI still doesn't work, thats the most likely reason for nvidia not including it.

last comment from luthier In May; Added ATI Crossfire support. NVidia SLI support will become available when a profile for the game is added in an upcoming official driver release;

The simplest way to know if your SLI is working is to create a new profile, point the profile to your CLOD launcher then stick some FSAA on and then activate the SLI slider, this will tell you if your game supports SLI, i would suggest using a basic SFR (split frame rendering) for starters. When I last did this there was nothing it simply didn't work.