No it's far simpler. It has fallof curve in diffuse slot that sort of looks like IOR 1.6, it goes for 70perc. near zero, then it goes up but plateaus again for the last 10perc, which is the angle at which we see the sofa "above".
Then instead of mixing black and white in as masks for bright and darker texture, the white mask uses a texture instead.
It's heavy scene that I can't open right now so I'll post that later but hope this describes it.