There are a couple of performance counter sets in Hyper-V that show memory usage. These counters tend to show memory used by one component of the system and the "Hyper-V VM Vid Numa Node" counter set is no different.
This counter set is intended to show memory used by the Virtual Infrastructure Driver (Vid). The good news is this counter set shows "guest physical memory". This memory includes the allocation you specify when creating the VM and some other support memory like video memory. It is the majority of the memory used by the Virtual Machine (VM).