Hmmmm.... neither pizza nor sushi.
Looks very close to an Smoked Salmon Flatbread appetizer I had recently at Tommy Nevins in Evanston.
(Garlic flat bread topped with smoked salmon, sour cream, avocado and spicy tomato relish.)
The name may be "totally new" but the dish isn't.
You can easily replicate it using a ready-to-bake pizza crust. Just bake the crust, let it cool, spread a thin layer of cream cheese/sour cream (I've had it with dill added). Layer on some smoked salmon and garnish (I prefer finely diced red onion and hard-boiled egg). Voila!
Call it whatever you like.