Terminals contradict Cryptum and Silentium?

I was a little confused because they seems not to line up in a couple ways. Am I wrong? I hope there is something that I’m missing. I have to re-watch them, as I can’t even remember the specifics of what seemed off, but I was a little disappointed because it almost seemed like they retconed the book.

Oh I guess one huge thing was the Didact never being re-awoken on Charum Hakkor, or even going into hiding in the first place in regards to the Halo rings being built, also why did none of Crytum as a whole get mentioned?

I mean if they are just going remove the books from the cannon what is the point of them?

Two Didacts!?