Removed vCenter node still in System Configuration after removal

I switched my primary vCenter server from a Windows box to the Linux appliance. Everything got moved without issue, so then I ran the recommended cmsso-util unregister command pointed to the old server to be decommissioned, as mentioned here: https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2106736

The old vCenter server was successfully removed from the list in vCenter Server Inventory, but when I go to Administration -> System Configuration -> Nodes, the old server is still listed as a node there. How can I remove it?

Also, when I go to Administration -> Users and Groups -> Users, when I look at the list of domains, I still see the old vCenter's Windows hostname listed there.

Thanks for any help.