one of them being listed as FSDT SODE JW1. Does this one particular listing refer to the model that Jeffrey Stahli designed?
No, it's a earlier kind of SODE jetway made by us for scenery we added SODE jetways too before GSX L2 came out ( I think KMEM and KCLT use it ), so it's not customizable with all the features like the other models, but it's still fully usable, so there was no reason to *prevent* users to add it with the editor.
It's included with GSX so, if you might worry about using it for a scenery you want to share, it's not a problem, since it won't require *those* sceneries to be installed, just GSX.
