IIRC, Ludo Kressh and the rest of his fleet/army disappeared after the war with Naga Sadow. They could be the remnants that still rule somewhere in the outer regions.
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Two, things. First of all the Great Hyperspace War was set 1000 years before the KotOR era - all the characters in those stories have long since died of old age.
Second, Ludo Kressh didn't escape - Naga Sadow killed him and destroyed his fleet, but lost most of his own during the fight, which made his forces defenseless when the Republic fleet tracked him back the Sith Empire. That's why the story was called "Fall of the Sith Empire". Naga Sadow escaped to establish his temple on Yavin IV until he was betrayed and apparently killed by his apprentice, Freedon Nadd (what actually happened there is still a bit hazy).
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I didn't mean that you would meet Ludo Kressh in the flesh in KotOR III. Just some descendants of those who fought with him. But i wasn't aware that the whole fleet was wiped out.
/me goes back to the drawingboard.