They are just GE Enbrighten Z-Wave Smart Switch . I have updated to latest version of hub and powered off and on the hub, still not able to remove devices.
If gopher.ny is on it I'm sure he will offer a solution.
Are you trying to remove them from the devices tab or from the zwave details page? I saw someone else who tried the former, got the error, then tried the latter and it worked fine. They will need to be completely removed from power.