Didn't Ajunta Pall have his own tomb? The one across Sadow's IIRC correctly...
Still, If the storyline is to make much sense, at all:
The Sith might have known about the Star Forge, but were not able to access it/find it. The more I look at this and how the ruins on Dantooine were sealed off (by the Jedi?), the more it looks like the struggle for the Star Forge might have been a very old one. Would it be likely that the great hyperspace war was partially about a vie for power to re-discover the Star Forge? Certainly sounds like an issue that warranted such wars.
I cannot think of any good reason that the Sith would have just let go of an artifact like the star forge if they really did have it in their possession.
1) there is a gang of all this great horrible sith stuff lurking in the shadows and
2) somehow they have stuff more powerful than the star forge
then would that not imply a major incompetence in the long run?
Oh sure they'd (the sith would have) been preparing for war for a thousand+ years and brought war to the galaxy for <3,000 years until the seventh battle of Ruusan (by then which all that original sith empire would have died out). Still, it just sounds like vague EU filler story even with the good math.