Kreia said this in regard to Naga Sadow:Ahead lies the tomb of Naga Sadow,successor to Marka Ragnos and the sith lord repsonsible for nearly conquering the Republic in the Great Hyperspace war a millenia ago Then she talks about Revan entering the tomb with Uthar that is it.
Kreia said this about Tulak Hord:This is the tomb of Tulak Hord,known as the greatest lightsaber duelist of the sith lords. His skill was considred remarkable even in his time,when many true lightsaber masters lived.
Then the player can ask her are modern jedi poorly skilled with the lightsaber.
Kreia responds with:If you were to face an ancient sith lord in combat,you would learn that we are as children playing with toys compared to the prowess of the old masters
Then the player asks what made him so good.
Kreia says:that is unknown but it was said he taught his technique in his holocron which has been lost when the new sith order arrived there.
I do not think she was lying when she said tulak was the best of the ancients and his hilocron was sought after in kotor one and was highly valuable so seems to be stating the truth. But saying the ancients were as good as she said they were with lightsabers seems far fetched to me. Yet she did not state that Naga Sadow was the greatest.