I'm still not convinced wifi is used for guiding the vehicles, just checking in to the ride control system. Wifi positioning does not have the accuracy needed. I think suggesting the building is a faraday cage, too, is over simplifying things. But I'm working off my knowledge of wifi, wifi positioning accuracy, and the tech used by the vendor.
You are absolutely correct in all of your points here. Just to be clear, it is the RFID that is the most precise reading and anything else is to confirm that it is generally correct. RFID guides the vehicles and seems to be somewhat inherent to the vehicles computers?.!?.? The steel inside was more of an initial conclusion and I never heard about the details or what was finally determined. At this point, I DON'T CARE. It is all so tiresome and scientific.