See How to Build a Solid Z-Wave Mesh for further detail on methods of Exclusion. If Hubitat Elevation doesn't show Unknown Device Excluded in the log, then the General Exclusion has failed and the device probably won't be able to be joined.
Typically the same button on the device for inclusion is also used for exclusion. If a device cannot be factory reset, or is in an unknown state, then it is recommended to do a General Exclusion in your Hubitat Elevation hub to be sure it isn't joined to the former Z-Wave mesh. Exclusion will happen automatically when the device is removed from Hubitat Elevation, however it is recommend that Z-Wave devices always be factory reset as well. While Zigbee devices can simply be removed and put into Paring Mode using the manufacturer's instructions, Z-Wave™ devices must be Excluded from their previous network before joining a new one. Before you can join your devices to your Hubitat Elevation hub, you must first remove them from the previous hub or bridge.