Looks like you also need to unlock "Myrkvidr". Which requires level 15,275 I'll see if this level unlock is wrong though. If it requires the next location I am thinking the unlock level should be at least 15,275 Thanks for letting us know.
Quick follow up. The level unlocks for many of the Blacksmith items from Myrkvidr are wrong. We will be looking to fix this up shortly. Unfortunately this means the level to unlocks for these items are going to go up.