No that's not true... You can choose to say Reven went back and united the sith before leaving...
Deadly_Nightshade
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Another discussion for another topic, but this is quoted from Wookieepedia
"Although the player of the game may have Revan end up as redeemed Jedi or a renewed Sith Lord, the canonical ending has him returning to the light side. This follows the usual practice of LucasArts, where the canonical storyline of all videogames ends in victory for the light. Additionally, although Revan can be either a man or a woman in the game, it is officially stated that, in canon, he is a man. "
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That's not true...
But if it's what you believe...
(by default Reven is a WOMAN in KotOR II)
Deadly_Nightshade