"The Sith race came first. They are the original inhabitants of Korriban, and the Sith culture we know today began when Dark Jedi exiles settled on the planet and mixed with the native population." After enslaving them, he means. It wasn't until much later that the Sith race were declared equals to humans within the Sith Empire. "I fear they're no longer around in your time. Those from our galaxy, from your time, haven't recognized my species." In his era, you'd have to be living under a rock to not recognize a Sith pureblood.

"I wondered about the markings, for none of the Zabrak that I've met had them." Which means that Savage must be a Nightbrother too. He can hear that note of pride, and it's something that he too understands. He might not be as dark-sided as his fellow Sith, but he takes pride in being of the Sith, in both biology and culture.