I don't think there is a jib in this case. Hans sailed one up at Zandvoort at least, and there don't seem to be any jib fittings in the photos.

Even without a jib I still don't think I would like to double the ropes going up the mast (or forestay) and have the back-to-back pulley swinging around up there as well.

As I understand it the only reason the F18s put the back-to-back up the mast is so they can lead the halyard from 1-2 metres up the mast and the crew can stand up to pull the spinnaker up.

Surely, the tidiest and least windage way has to be with the pulleys running along the pole.