その解決法の続きです。Package Managerから「ARKit Face Tracking」を削除し、iOSでビルド時に出る以下のエラーの対応からです。
Assets/Scripts/ARKitBlendShapeVisualizer.cs(47,5): error CS0246: The type or namespace name 'ARKitFaceSubsystem' could not be found (are you missing a using directive or an assembly reference?)
The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.