I have searched extensively for diagrams or explanations regarding the fields and eddy currents associated with both Electrodynamic Suspension and Electrodynamic Braking. I can find no information on whether or not a mirror image magnetic field should have 2 polarities. If it is the eddy currents and their magnetic fields which create the powerful lift involved with Electrodynamic Suspension, or drag induced by Electrodynamic Braking, then these fields should have 2 polarities. If the polarity does not change under or through the copper plate, then the there is only one polarity, and this appears to be the field from the magnet/s only. Not an induced mirror image.
I have done only limited low speed testing of a machine similar to the one above. Because these magnets are alternating there is a need for more sensors and connection to an oscilloscope. My tests indicate that the field polarity from each magnet extends through the non magnetic conductor, and does not change whether the rotor is moving or not.
A video on Youtube shows an actual working machine with 4 motors and 4 rotating magnets utilizing Halbach Arrays. https://www.youtube.com/watch?v=pCON4zfMzjU&t=17s
An animation in this video clearly shows only 1 polarity below, and strangely, even the actual magnet above shows only one polarity.