No, but they do use resistors which let some of the cut coil's signal through. This setup keeps the tone full sounding and the output doesn't drop too drastically. The LT pups sound great split in this configuration.
I don't really know how they do it, but from personal experience my favorite split sounds are from the DGT, but I absolutely LOVE the 594 with the 58/15LT pickups either in humbucking mode or splitted. I really like how these two guitars maintain their output when split.