Starting with the Council of Nicaea in 325, they've changed the biblical canon multiple times since with various councils and versions of the bible.

The King James version being the biggest culprit which totally misrepresented 'Hell' and put more emphasis on an Earthly King's authority (the og statists lol)

I'll take a look at that preface. We don't own a copy of Enoch yet so if you have suggestions on good translations I'm all ears. Thanks!