Revan likely had the foresight to change the code to unlock the door, unfortunately.

"I hope you don't turn out like I did. I hope your Sith don't try to use you," he says, even if Kale can't hear him. Tobias follows, and takes hold of Kale's upper arm long enough to brush a kiss on his cheek. "I hope someday you'll forgive me." He lets out a breath, and with it comes agony and the sensation of hundreds of thousands dying - not a short and sudden feeling like Alderaan, but long and drawn-out - and with all of that is hate and rage, terror and fear. The sounds of screams from thousands of throats and from hundreds of species slams in like a tidal wave.
Seeing the last battle of the Mandalorian Wars through the eyes of the Exile, it's plain to see how comforting the silence that comes after severing yourself completely from the Force can be.