Good lord, this is high school physics! Do you even know what a force is?
Let me help you out there is no net force because the surface of the ball is not moving. It is staionary because the pressure of the fluid is matched by the internal pressure of the ball, if it wasn't then the ball would collapse or expand. Since the surface of the ball in the fluid does not move there is no net force on the ball.
There is pressure exerted by the fluid toward the ball.
Look up normal force on google it might help you out.
You should really take a physics course.
The ball is placed into the tank full of a superfluid. The ball is able to condense. While the ball condenses does the superfluid remain where it is? Does a void open up in the middle of the superfluid where the ball had been? No. This is evidence the superfluid exerts force toward the ball.
Take a balloon made with a very think layer. It has a certain volume in air. Now place the balloon into the tank of a superfluid. Does the balloon still maintain the same volume? No. This is evidence the superfluid exerts force toward the balloon.