Originally posted by Darth Angel
After the devastation of Korriban at the end of the Great Hyperspace War and the flight of the Sith from their homeworld, the red planet was forgotten. That is, until two Jedi veterans of the Mandalorian Wars happened to arrive while searching for a powerful weapon."
This isn't even correct as Exar Kun visited the planet about 40 years before Revan and Malak and I think he may have been the one to originally establish the academy on Korriban.
EDIT: On another note I have't seen another site mention Naga Sadoe as the sith emperor other then IGN nor is it on his wookieepedia page though they did update other pages and create some new ones about the videogame, so myabe it was a mistake.