The plugin is mainly for that use case if you want to use the card for example in your Docker container for transcoding, foldingathome, boinc, mining,... (there are many use cases)
No, this plugin does nothing if you are using it like in your case in a VM and bound it to VFIO, no you can't get the stats of it if it's passed through to the VM because the VM has exclusive access to it.