I believe he is referring to balls that would rather rotate around the "Z" axis, rather than balls with a regular Mass Bias and rotation on the "Y" axis.
I believe that the newext Visionary ball, the Mixed Breed, is a ball that is called a "Z" spin ball.
With you saying that it spins 180 degrees to the mass bias, I BELIEVE, is tantamount to saying "No, it is a "Y" spin ball", if I am understanding correctly.