In VMware Aria Operations, ESXi hosts that have been decommissioned or removed from vCenter Server may continue to populate in reports and inventory views for several weeks. This occurs because the system retains deleted objects for a specific duration based on internal retention policies.
VMware Aria Operations 8.x
This is expected behavior.
This is expected behavior. The duration that deleted objects remain in the inventory is governed by the Data Retention settings in the Global Settings configuration. By default, the system retains these objects to preserve historical data for reports and dashboards.
More information about configuring data retention can be found here: Modifying Global Settings