Another traitor to his race.
He wasn't. He was what you would call a true moderate or a neutral. He worshiped deities from both human and elven faiths. He was a mage that hunted demons and abominations.
For all intentions and purposes, he seemed like an outstanding and remarkable individual who did what he did because it was the sensible thing to do, just like Garahel. He did not do it because of elven agenda or human agenda or anything. He did what he did because that was the best he could do.
If anything this DLC reveals that Chantry, just like everyone else in Thedas, twists history to suit their purposes. In history in real life, this form of history writing is known as national historiography.
National historiography is a form of history writing that is written by and promulgated by nationalists and governments to, supposedly foster nationalism, national identity, to help with national building. To do this, historians that are either nationalists or are commissioned by nationalists or the state craft a history that is favorable towards the idea of that particular nation. This results in scrapping of or whitewashing of facts that might cause people to think and question things.
It is essentially the history we learn in school textbooks or in government endorsed documentaries.
Personally, I think that is a load of bollocks and prefer academic history and/or total history since I am not one who is very patriotic or tribalistic. Heck, I have even gone on record in the university I am studying to say that national historiography is just a fancy term for censored history.
In Thedas, the Chantry did this to foster an Andrastian identity and to help build the Andrastian faith as well as promulgate it. In the process, they had to scrap things that would make faith building too complicated or too open to questions and queries.
So in the end I suppose this DLCs prime purpose is to dispel the Andrastian censored history.