I think the above poster is referring to how the Chantry, after the Exalted March on the Dales, purged any references to elves and eleven contributions to society and culture, including figures of any historical merit, especially any elven involvement with the formation of Andrastian faith.
In comparison, the Dalish haven't collectively, intentionally lied about anything regarding history (yet, I should add).
There is a difference between deliberately obscuring the truth (i.e. lying) and getting things wrong (i.e. being false). A scientist can make a hypothesis about a phenomena which can be drastically wrong - that's not a lie, which always requires an awareness of what is true. So it is correct to state that the Dalish are trying (and failing dreadfully) to uncover the truth.
Therefore, regardless of your position on elven isolationism, I think it's not too controversial to argue that the Chantry have done more to falsify history, particularly concerning elven-human relations, than the Dalish. Whether the same would be said of the Dalish, if they'd beaten the Exalted March and conquered Orlais, is a more interesting question (and one I won't attempt to answer).
But enough about that.
In terms of party, I don't usually like Cole but he had a lot of relevent things to say this time around. Cassandra has a lot of seeker related dialogue at the old temple.