They are not only lying to the Order, but they are lying to themselves by being in denial. In the time of the prequels, the Jedi Temple Library prided itself with having all the knowledge in the galaxy, with it’s librarian, Jocasta Nu, stating “If an item does not appear in our records, it does not exist”, when in reality, much of their information was tampered with or missing. As any religion, they are very limited to what their followers learn regarding the past of the Order, the horrible events that the Order has done in the past, and restrict information that is considered “dangerous”, when in most cases, it is simple knowledge that may cause someone to see outside the inner bubble that the Order resides within.
My only concern with this being in the Jedi code is that although the Jedi seek to gain more knowledge of the force, they also tend to stop others from gaining the same knowledge.
The second line of “There is no ignorance, there is knowledge” is a fairly standard line that I tend to agree with, and I’m sure the Sith would agree with as well.