26931 - Still No Official Firmware?

I see this from August 2017: Trouble using GE 26931 switch/motion sensor with external motion sensor

I don’t see any notice about these not being supported but when I tried to connect them they still don’t have firmware.

SmartThings maintains a list of officially supported devices. And there are many more that can work with community developed device handlers. But I don’t think there’s any place to check for devices that aren’t supported.