Official comment
Yes, this was made available when the NXS2 came out as it was around the same time laptops no longer had ethernet jacks built-in, so our engineers created an alternative (the USB bridge).
For older players, you'll either have to link them to a CDJ-2000NXS2, XDJ-1000MK2, DJM-900NXS2, or any TOUR1 product, which could connect over the bridge, or you'll have to resort to using an ethernet adapter. Sorry!