I just purchased Secrets of Xen'drik and they introduce the original Warfroged, the Quorcraft which unlike regular Warforged are regular constructs. Then later they describe the new Components that can be found (usually attached to the Quorcraft) one of which is a Belt of Fortification.
Now why would you equip constructs with magic items that give fortification? There seems to be a gap in logic there.
I noticed that as well. I have 2 different suggestions. Under the listed of Shira the docent it says that the docents were suppose to hold the Quori. So, you can think of these Quorcraft as empty Vessels that the ancient Quori used to possess like the Inspired of "today". So, back in the day, they would have been more like living constructs.
Or, what I plan on doing is just making the Quorcraft living constructs with a penalty (-4 or -6 perhaps) to both Intelligence and Charisma.