I too was shocked to see that article in Dragon, and the first thing that popped into my head was: WHY?!?!?
Dragons have way too much pride in their own abilities to use petty equipment like armor and weapons. They know they are already a walking(flying) arsonal, and somehow I just can't see a dragon belittling itself with such things. Magical items such as rings, amulets, rods, etc. Sure, they would enhance the already formidable dragon abilities, but armor and weapons?? Why? Dragons claws and bite do more damage then any weapon, and the armor would create restrictions the dragon would other wise ignore due to its fabulous scale armor. How much would that armor weigh to cover something that big? 2-3000 pounds? how could it fly?
The article is, simply put, useless really.