The KB is to explain possible issue when moving ESXi from an NSX cluster to a non NSX cluster and how to mitigate the issue.
Symptoms:
Your NSX Manager is 6.4.2 or later.
When you move ESXi from an NSX cluster to a non-NSX cluster, you may experience following symptoms:
2019-09-03 06:15:35.883 GMT INFO DCNPool-8 VimNotificationHandler:106 - - [nsxv@6876 comp="nsx-manager" subcomp="manager"] Received DELETE notification for object HOST_SYSTEM/host-2065
2019-09-03 06:15:35.938 GMT INFO DCNPool-8 NwfabricInventoryDataChangeHandler:108 - - [nsxv@6876 comp="nsx-manager" subcomp="manager"] Host host-2065 deleted. Marking as unprepared.
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.