... Maybe you could say it's scripture because the Ethiopian Church says so, and whatever that Church says is authoritative? I would probably simply verify consistency and ask if you're a member of the Ethiopian Church, and if you were, I probably wouldn't argue further.
Well, better go for one more, then I gotta go.
Scripture means "writing", and the discussion about Enoch is that it is and has been,always. "Sacred writing".
The Ethiopians who turned to the Gospel in the first century were Torah practicing Israelites of the first dispersion. They had Enoch as part of their "Bible" collection of sacred writings.
Bible means collection of books.
They kept it in their "Bible" after they received the Gospel, and not being under Rome, they never cast it out, never banned it.
It is canon in their Bible.
I'm not Roman Catholic, so why would I give the early RC rulers authority over what I consider sacred writing that completely corroborates with what came after it, when Moses wrote?
I do love true history, and do love Enoch because it lays the foundation of all Holy doctrines written by all the prophets who came after.
I have the DSS scrolls translated by several different authors, and find corroboration in them for the book of Enoch, and even more of Enoch's writing, like the book of the Giants.
Moses had it, and read it. Hannah had it, and readit. Abraham had it, and taught from it. Job had it, and understood the passages on The Son of Man as his Kinsman Redeemer who was to come, and who would resurrect his flesh.