Well thats consistent with LDS, Islam, and many other cults who all claim new information not contained in the original manuscripts.
Exactly CB... unfortunately one of the ‘earmarks’ of false religions, and as you stated..cults...most claim this..and generally part of the bait and switch process.
Once an individual accepts this “new information” in which usually designates them as the “only ones” to have such revealed, they are open to any other false teaching along with it.
Also it’s common the “leadership” makes the claim....in order to be palitable to the entire. Signiture approval so to speak.
The Catholic Church does not claim "new information" and it is the Catholic clergy who wrote the "original manuscripts".