From the GSX I can see the AFCAD is PANC (AFX_PANC_sim-wings_04.bgl) and nothing else. GSX Menu doesn't show any ICAO or airport name. I think I am not looking at the right spot. I launched ADE and I can see the Z41 and LHD on the same PANC airport only from Default Stock. I don't see Z41 or LHD in the Aerosoft AFCAD.
So what you reported as a "bug" in GSX that you couldn't exclude Z41, wasn't true. The visibility WORKED, because GSX IS seeing PANC, as clearly indicated in the scenery editor page, which lists PANC as the active airport. So yes, visibility exclusions are working perfectly fine.
So, the problem is that GSX is not seeing any jetways. Which jetways is the scenery using right now ?
If they are made with SODE, a common problem is the developer has used wrong gate names in their SODE.XML file, which is not a problem if you only use SODE, but if you use GSX, the gate name MUST be correct and conform to the SDK standard, otherwise SODE cannot communicate with GSX which jetways is at which gate, see a more detailed explanation here:
http://www.fsdreamteam.com/forum/index.php/topic,23691.msg157932.html#msg157932