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The example on johnfail's blog, is referring to Win8/WS2012 and shows the UI for GPP (not ADMX), and he says IEM (the old method) is no longer available as of Win8/WS2012 (which is true), due to the introduction of IE10.

Note: You will have issues if you are using the Windows 2003/2000 GPMC, since they are not supported. The central store, ignoring any ADMX files stored locally on the Windows Vista administrative machine.

After the central store has been created the Group Policy tools will use the ADMX files only from Group Policy Object Editor automatically reads all ADMX files stored in the central store. Right-click the name of the GPO you created and click Edit. To create a new GPO to edit, right-click the Group Policy Objects node and select New. To open Group Policy Management Console on a Windows Vista machine, press the Windows logo key + R, and then type GPMC.msc.

Quote: To edit administrative template policy settings using ADMX files This isn't true according to MSFT either: (v=ws.10).aspx

This isn't true according to where you can see the screenshots with your own eyes that this is possible.

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