I have Lutron casata for almost 3 years been working fine with Google recently Google cannot connect to lutron decided to unlink and relink to fix the issue but it will not unlink every time I unlink from Google home the switches still show up in Google home the switches work fine with the Lutron app when I try to relink neutron anyways I get an error no devices were found in your Lutron account which is obviously incorrect cuz devices are present in the Lutron app and work
I have tried resetting Lutron switches powering Lutron on and off deleted Google home short of deleting my house from the Google home app I have tried everything else
So sorry to hear about the issues you're having with unlinking your device from the app, I'm sure it's frustrating, but I'm happy to help.
I would suggest uninstalling the app and reinstalling it, as well as deleting the household that the device is in and creating a new one. You can also create a new household within the app, move the device to that home, then try deleting that household altogether as well.
Please let me know if you have any other questions.