That's the point. He didn't learn anything from Pandaria and instead opted to support the one-faction system in typical Black Dragon fashion, which is then pointed out why it's wrong.
Tong the Fixer: Always you speak. Never do you listen! You ignore the lessons of Pandaria!
Tong the Fixer: You see, there is balance in all things. Wisdom etched in our very fur: Black and white, Darkness and light.
Tong the Fixer: When the last emperor hid our land from the rest of the world, he also preserved the homeland of our ancient enemy, the mantid. Why did he do this?
Tong the Fixer: He did so to keep the land whole. Living with the mantid for ten thousand years has made us both STRONG.
Tong the Fixer: So it is with your Alliance and your Horde. They are not strong despite one another; they are strong BECAUSE of one another.
Tong the Fixer: You mistake your greatest strength for weakness. Do you see this?