Doesn't it currently only ("only") provide the ability to recruit champions from both kingdoms and empires, and provide the Broken Loyalties spell, while the Silver Tongue spell itself comes from the Diplomat sovereign career? I think that just the champions aspect alone would probably still be worth more than one point, while Broken Loyalties wouldn't be worth one point in most games unless it was paired with an influence-generating trait like the Altarians have.

Although a custom race that did pair up those abilities would be pretty hardcore.

If you think that the whole package is not worth 2 points, there's something I wish was added to the game, and betrayers seems the place where it would fit.

The ability to capture buildings that you cannot build yourself.  So that Karavox, for example, could occupy a Pariden city and keep the watermill, the scrying pool, and the essence temple.

This is a very situational advantage, but it's a cool one.