Yes, I opened a ticket about this. It has been confirmed as a bug.
I have been told that a future release will count VM resources as they are onboarded, but VMs that have already been onboarded will never be counted.
Basically any non-greenfield deployment would need to offboard / onboard all previously onboarded VMs again (which AFAIK would be non trivial as Ownership information would not be retained without external methods - I for instance make vRA 8.x set and update the old 7.6 'VRM Owner' custom attribute).
This also breaks Quota Policies, which do not count onboarded VMs against the quota...