To help users if they are unable to add/move a non-DPU host into an empty vCenter cluster or a cluster with disconnected hosts.
Symptoms:
This happens because the cluster remains associated with the DPU vendor of the host even after all the hosts maybe removed from/disconnected from the cluster.
The behavior is currently as per design. This KB will be updated when any backend changes are made.
Workaround:
The recommendation is to create a new cluster on the vCenter and use it for adding/moving non-DPU hosts.