You can choose to use the ESXi CLI to remove the snapshots if you are using the Host Remediation Tool (HRT), or if you prefer the flexibility of CLI usage.
You must have the VMID from the Host VMs tab in the Inventory Assessment Workbook generated by the 7-Mode Transition Tool (7MTT).
After deleting snapshots, you must regenerate the Inventory Assessment Workbook to collect information related to Data ONTAP operating in 7-Mode and your ESXi hosts.