The Magnus effects works by creating an area of high pressure that pushes the ball away. The Seam Shifted Wake effect (SSW) basically works by creating an area of low air pressure and the ball is pushing into that due to the relatively higher air pressure on the other side of the ball.

A good example of why this works can be thought of by understanding how an airplane wing create lift. The top of the wing is curved and when slicing through the air the air on the top of the wing has to move faster than the air on the bottom. The faster moving air creates an area of low air pressure and the plane gets lifted up.

The seam pattern on a softball allows for a long, mostly continuous seam if it is rotated in just the right way. If this long seam is placed on the horizon of the ball for most of a rotation the air on that side will move faster (flowing over the seam is like flowing over an airplane wing). The ball then gets pushed into that resulting low air pressure area. So for a rise ball the seam needs to be on the top of the ball and that will create low pressure on top and the ball can rise, or at least fight gravity.

Here is a link that explains this better and with more scientific rigor. The link deals with baseball but the same things happen for softball. As much as this changed baseball I expect a similar result as more coaches start teaching. As of now (end of 2026) generally only the colleges into high tech (like Oklahoma, UCLA, Texas and others) are understanding the impact and teaching it. Others seems to be copying the observed spin but without understanding why it works it is difficult to help the pitchers take full advantage.