Does "Physical Client Parallelism" include cluster virtual instances or just VMs?

Networker 8.2 Administration guide - https://www.emc.com/collateral/TechnicalDocument/docu53903.pdf - has these blurbs on page 491:

"If you are backing up virtual clients, you can base the client parallelism setting on the underlying physical host. In this way, the total number of save streams for all of the virtual clients that reside on a physical host are limited to the value specified for the physical host."

When they're discussing "Virtual clients" does that include Microsoft Cluster virtual cluster instances, or VMs (ESXi, Hyper-V, etc.)?

We have been discussing this internally and my opinion is that since there is a place to specify on the General tab of a client's properties whether it's a "virtual client" and what it's "physical host" is, that this only applied to hypervisor clients and not clustered instances.

If someone has an authoritative answer or any information that can clear this up for us, we would appreciate it.

Thanks in advance!