I think this is what he meant:
1. Log in console for each of the EVS Appliances and select "vShield registration" - "UNREGISTER"
2. Log in vShield Manager web interface, select each of the ESXi servers, and select Uninstall vShield Endpoint (in Summary tab)
3. delete vShield Manager appliance, deploy everything again starting from vShield Manager.
and yeah you should also manually delete the deleted appliances in ERA.