VNM Fault Isolation > Contact Lost Model Destruction is enabled with a Destruction Delay of 7 days.
We have many devices in the Initial state that are not being automatically deleted from Spectrum and they have not had a successful poll in more than 7 days.
Release: Spectrum 20.x
Devices with a Contact_Status = Initial (2) will not trigger the deletions as it's not considered contact status lost.
The VNM Fault Isolation > Contact Lost Model Destruction setting will only be ran against devices with Contact_Status = Lost (0)
Check the Spectrum Server Administration guide for more information on Significance levels and how it relates to Contact_Status.