Finally, after years of living with the ghosts, I was able to remove them. Thank you very much, following every step I didn't miss a thing, everything was perfect. Many thanks to everyone for this fantastic work, especially @danabw who quickly answered my request for help, and the excellent material here. Without a doubt the best clarification post in the whole community.
I'm glad things worked out well for you. 
Thanks for the very nice message.
Two questions:
I have a number of devices that show no route but appear to be ok. Example:
The definition of ghost above is one that has no route. However this device and the others like it appear to be fine. So just confirming that there is nothing wrong with not having a route in this case?
Second question, can you remove an S2 authenticated ghost with Hubitat built-in tools? I have tried remove on one node several times and all I get is Pending. I am not sure how long I should wait before I move over to getting out the Silabs tools?
That's not a ghost. Routes will eventually populate in your example) You can go to the device page itself and try to force a refresh and it will populate
Yes, you should be able to. Some ghosts are more stubborn than others, but S2 should not keep the Hub tools from removing the ghost.
THere is a button at the top of the Z-Wave details page - click it and some of your Z-Wave details info should update...
Does the [Guide] Firmware Update using PC Controller (Z-Wave Devices) method still work? I've used it successfully in the past to remove ghost devices with a UZB stick (GoodWay Z-Wave Plus USB Z-Dongle Z-Wave Radio Stick WD6050). However, I've tried it multiple times over the past few weeks with no success. Pairing never completes with my C-8 (2.3.9.201). I've tried re-installing everything on a different PC. I've excluded the UZB dongle many times. I've probably tried 100 times overall. The UZB is 10 ft away from the Hubitat, clear line of site. Before I waste more time, can someone confirm that this method still works and that a Hubitat update didn't break something? Thanks.
Sorry, confused. The column labelled route is blank for this device. I have a number of devices that are showing no details in this column. Are you saying this is not the lack of route I should be looking for?
The refresh buttons on the individual devices or at the top do not appear to be adding any new information. Out of the three potential ghosts I have been working on one is saying "Device is Not responding" but will not give me a remove. The other two are showing "Pending". Time to get out the laptop with the Zooz stick and take them out there.
As far as I know it works. Do a reset on the stick with pc controller then do a shut down and unplug the hub for 30 seconds. Try pairing the stick after it boots back up.
On that device page click configure, then refresh (NOT the refresh on the z-wave details page). The device is NOT a ghost. The fact it's showing properly in the DEVICE column shows that.,
Thanks for the advice Jeff. I gave that a try a couple of times but it didn't make any difference. I can exclude the stick via Hubitat, but neither NWI nor Classic mode work. Hubitat and PC Controller just eventually timeout ("15:19:17.340 Learn mode Removed completed in 00:01:05.639").
Thanks - I know it is a legit device - I use it to monitor the power line in case of failure. I tried multiple times to get it to update and gave up. Tried again this morning and what do you know - it updated.
One question about the Z-wave details page. In the documentation it says "Shows the hops the Z-Wave signal takes from the hub to the device (using hexadecimal node IDs) and the speed of the link"
It seems to not always to keep the last known route there as I see various devices showing no route when I bring up the page at different times? Then I refresh them and get a route. And then can look later and they may or may not have a route in there?
There have been some issues with the ZWave statistics refresh lately and I believe the staff may be re-working it. Until then it might be wisest to click the refresh button when you first open the screen to ensure you’re looking at the most recent data.
Thats pretty much normal right now.
You can either refresh the individual device or click the refresh stats at the top. The automatic stats collections was causing zwave lag so it is shut off right now while they figure it out and you have to click the button.
I clicked the button earlier today to see if it would stop z-wave rules from running as it had when it was automatic on the hour and half hour. And yes, stuff didn't work, for a short time!
Download the Hubitat app
