No control surface tail sitter

Good evening. So I came across the Swan k1 pro and notice that it does not have any control surfaces and that attitude control is done entirly by the motors.

Question. Do the wings offer usefulness performance / aerodynamic value in a build like this or is it simply a structure to which one fixes the motors

yes, its a normal plane when in fixed wing modes (with four forward motors) with the wing providing all the lift, however, the motors do provide the pitch,roll, and yaw since it has no control surfaces!!