Sorry for no reply. I was aware of the issue. I had to update the item import method to now use the blizzard community api, which has for every item the correct value for upgradable. First I used the table from the WoW Client which isn't up-to-date. Not it should be all correct. If you load the site first time and you don't see your boots please try a reload from armory, but it should work immediately.
If there are other items missing please let me now.
Another Topic:
Are people out there who already used
[Eye of the Black Prince]? Is there an achievement attached to it?