What?
Vivec mentions through direct dialogue with the Nerevarine that he does not sense the Dwemer in "the timeless divine world outside of mortal time." There's no reason to believe he's using his Water Face. Also, the Aurbis includes Aetherius, the Void, all Outer Realms, and everything.
Vivec doesn't sense Dwemer because they aren't Dwemer anymore. They're the golden soul flesh of the Brass God.
I admit that i was wrong with water mask part, mixed books.
From Vehk's teachings:
Outside the wheel is the void, bereft of anything. It cannot be named. If it has more aspects than stasis and change, they are outside of true language. Inside of the Wheel is the Aurbis, as I have explained.
....
For ages the etada grew and shaped and destroyed each other and destroyed each other’s creations. Some were like Lorkhan and discovered the void outside of the Aurbis, though if some saw the Tower I do not know, but I know that, if they did, none held it in such high esteem. In any case, some of those that did see the void created its like inside the Aurbis, but each of these smaller voids sought each other out. Void shall follow void; the etada called it Oblivion. What was left of the Aurbis was solid change, otherwise known as magic. The etada called this Aetherius.
To me this says that there are things outside Aurbis... I could be wrong here too, wouldn't be big surprise.