message in wizard wants to say, that all virtualization data are polled via vCenter, so you don't need SNMP, because ICMP is enough for virtualization.
Interface statistics are network data. It is correct/safe/useful to have ESX polled via vCenter and managed as SNMP node.
Same for vCenter. You can add vCenter as a snmp node - so you will receive some snmp counters for network node + virtualization data if you check poll for vmware with correct credentials.
Hope it helps.
Great, thank you.