There was a comment left by someone who apparently genuinly wants to know if the LXX (Septuigent) is a lagitimate B. C. document. Here are some links I’ve found helpful and a book recommendation.
The book is called “The Mythological Septuigant” by Dr. Peter S. Ruckman
If anyone has any sources to add, please leave them in the comment box. Thanks and God bless.