All instances are removed from both WindowsINF and WindowsSystem32DriverStoreFileRepository using the pnputil.exe shipped with Windows, and verified through Windows Explorer and grep utilities. I’ve seen this on the Asus mentioned above, and a Virtual Machine running under Virtual Box.
After you think that you have uninstalled and removed WinpkFilter driver I would also check if registry key HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesndisrd still exists. Sometimes uninstall does not remove this key.