This guide provides a false sense of hope, I'm afraid. Securing Windows from Microsoft's invasive policies is basically impossible. Cortana has now become un-removable:
http://www.pcworld.com/article/3100358/windows/you-cant-turn...
And those of us who thought we were safe using Windows 10 Pro woke up today to discover that the forthcoming Anniversary Update will actually be removing our ability to disable many of these features via the Group Policy editor:
http://www.ghacks.net/2016/07/28/microsoft-removes-policies-...