Stretched Cluster decommission Procedure.

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VMware vSAN

Decommission the vSAN cluster since the data has been migrated to the new vSAN cluster.
The procedure can also be used wherein just vSAN is to be decommissioned while VMs on other storage types (FC/iSCSI/NFS) is to be kept intact on the cluster.

Power off the unused VMs on the 'Robo vSAN cluster' vSAN Cluster
The data has already been replicated to another vSAN Cluster, and all replication settings are cleared for the current vSAN cluster.
Disable the vSAN Performance service using the vCenter RVC tool.

Refer: Unable to Disable Performance Service in vSAN 8
Disable the vSAN Stretched cluster
Navigate to the vSAN cluster
Click the Configure tab
Under vSAN, click Fault Domains
Click Disable Stretched Cluster.
You will see the following message:
Remove Witness Host
Removing the Witness host from the vSAN Stretched Cluster will leave it in a misconfigured state. You will still be able to use the two fault domains.
Click on remove.
Place the vSAN Data nodes on maintenance mode with no action.
Delete all the vSAN Disk groups.

Refer to: How to remove a disk from a vSAN disk group/host
To disable vSAN on the cluster:
Open the vSphere Web Client.
Click the Hosts and Clusters tab.
Select the cluster intended to have vSAN disabled.
Validate vSphere HA is disabled on the cluster via Configure > Services > vSphere Availability.
If not, then temporarily disable it (and re-enable it after disabling vSAN) via Configure > Services > vSphere Availability > Edit > slider to off > OK
Click the Configure tab.
In vSAN, select Services, then click Turn off vSAN.
Click OK.

Refer to the following documents for your reference:

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