You are correct! Although the term "Deuterocanonical" is helpful to introduce here, as apocrypha is also used in ways that don't pertain to Enoch and that makes everything confusing. Deuterocanon simply means second Canon, which is appropriate.

Additionally, most of the difficult sayings of Jesus quote the book of Enoch. This is important because it tells us that Jews of His day read Enoch, enough to be VERY familiar with it.

Parts of Enoch make it impossible to miss that Jesus was the Promised Messiah, and these parts were written more than 150 years before He was born. It then becomes significant why Jews felt it necessary to remove Enoch from their Canon.

Define apocryphal as you’re using it, because I don’t think those two words are mutually exclusive? Apocryphal just means “not included in the canon”, and considering who selected that canon, it seems logical that {they} would exclude the gnostic texts

https://en.m.wikipedia.org/wiki/Book_of_Enoch

Specifically id point you towards:

The main peculiar aspects of this Enochic Judaism include:

the idea that evil and impurity on Earth originated as a result of angels that had intercourse with human women and were subsequently expelled from Heaven;[55]: 90 

the absence of references to terms of the Mosaic covenant (such as the observance of Shabbat or the rite of circumcision), as found in the Torah;[58]: 50–51 

the concept of "End of Days" as the time of final judgment that takes the place of promised earthly rewards;[55]: 92 

the rejection of the Second Temple's sacrifices considered impure: according to Enoch 89:73, the Jews, when returned from the exile, "reared up that tower (the temple) and they began again to place a table before the tower, but all the bread on it was polluted and not pure"; the presentation of heaven in 1 Enoch 1–36, not in terms of the Jerusalem temple and its priests, but modelling God and his angels as a court, with its king and courtiers;[59]

a solar calendar in opposition to the lunar calendar used in the Second Temple (an important aspect for the determination of the dates of religious feasts);

an interest in the angelic world that involves life after death.[60]

Edit4edit:

it seems to predate

Yeah hence my use of “lowercase g, gnostic” - I don’t mean to link it to the neoplatonists or anything like that

We know you by your fruit