No. Well, kind of. Others may know more about this than me, but my understanding of the way the 3D effect is produced and based on using the SS3 with the Nord Electro 4 and 5 simulations is this:
Assuming no reverb or other sounds in the mix, if you were facing the simulated rotating speaker driver and it was "pointed" directly at you, the SS3's front speaker (only) would be making sound. If the driver then rotated to your left, the SS3 side speaker would begin sounding, positive phase out one side, negative phase out the other. As the driver rotates to the rear, the SS3 front speaker takes over. As it rotates to the right, the SS3 side speaker takes over again, this time with the phase polarity reversed.
So, that's what it sounds like to me, and explained based on what I have read in this thread. If you A/B'd it with a Leslie, there would be a big difference. If you A/B'd it with two stereo speakers, there would be a different difference. In this thread, there are YouTube links to demonstrations of the amp, but they may be either stereo recordings of the SS3 in a room or close-mic'ed mid-side recordings.
You really have to hear one.