Cant query VM's file using root\virtualization WMI namespace in Windows 2012 R2

I am using following script to get list of disks attached to vm.

$HyperVParent = "localhost" 
$HyperVGuest = "testvm" 

$VMManagementService = Get-WmiObject -class "Msvm_VirtualSystemManagementService" -namespace "root\virtualization"
$Vm = Get-WmiObject -Namespace "root\virtualization\v2" -ComputerName $HyperVParent -Query "Select * From Msvm_ComputerSystem Where ElementName='$HyperVGuest'" 
$VMSettingData = Get-WmiObject -Namespace "root\virtualization\v2" -Query "Associators of {$Vm} Where ResultClass=Msvm_VirtualSystemSettingData AssocClass=Msvm_SettingsDefineState" -ComputerName $HyperVParent 

# 
#Getting the Path's for Attached VHD's 
$VirtualDiskResource = Get-WmiObject -Namespace "root\virtualization" -Query "Associators of {$VMSettingData} Where ResultClass=Msvm_ResourceAllocationSettingData AssocClass=Msvm_VirtualSystemSettingDataComponent"
-ComputerName $HyperVParent | Where-Object { $_.ResourceSubType -match "Microsoft Virtual Hard Disk" } 
     
ForEach-Object -InputObject $VirtualDiskResource -Process { 
    Write-Host "Virtual Hard Disk At: $_.Connection[0]" 
} 

# 
#Getting the Disk Attachments for Passthrough Disks 
$PhysicalDiskResource = Get-WmiObject -Namespace "root\virtualization" ` 
    -Query "Associators of {$VMSettingData} Where ResultClass=Msvm_ResourceAllocationSettingData AssocClass=Msvm_VirtualSystemSettingDataComponent" ` 
    -ComputerName $HyperVParent | Where-Object { $_.ResourceSubType -match "Microsoft Physical Disk Drive" } 
     
ForEach-Object -InputObject $PhysicalDiskResource -Process { 
    Write-Host "Passthrough Disk At: " ([WMI]$_.HostResource[0]).ElementName 
    Write-Host "Passthrough Disk Drive Number: " ([WMI]$_.HostResource[0]).DriveNumber 
}

Same query would not work on Windows 2012 R2. 

Aparently root\virtualization namespace is deprecated from the Windows 2012 R2. Did anyone observed the same?