Saying that they can make a tank kit, but just slap a red mage name on it and it won't be a "proper" red mage is the very essence of saying that it can't be done, without out right stating it. It had to do with the tank meta in so far as it's "enough survivability to survive, put everythingelse in damage."

They can very easily put in red mage as a tank, while adhering to it's past incarnations. Whether they will or not is another question entirely.