AOS (ESXi) and ROBO licensing model

Dear All,

I’ve have a question about a licensing of the AOS (ROBO per per VM).

Environment: vSphere7 (vCenter7 + 2-node ESXi clusters). Basically, fresh Nutanix cluster with HA feature enabled is hosting x4 “service” Virtual Machine:

• * x2 CVMs,
• x2 vCLS ( https://kb.vmware.com/s/article/80472 )

As far I understand CVMs don’t need to be covered by the ROBO license, but what about a vCLS? How AOS is qualifies vCLS: as a service or a “standard” VM?

Also, do I need ROBO license for the powered-off VMs?
Regards,
Dominik