You might like to consider that the Protestants and their fellows make little use of the Septuagint - Their Old Testament Scriptures derive from the Masoretic tradition... From the Hebrew.
Good point I missed earlier. Thanks for bringing that up.
Today is a different world and even after the Torah was translated, the rest of the Tanakh as we call it was done by superior translators.
But you have to understand what these guys did. Then as now when someone copies a Torah scroll, one flub can cause the entire Torah to be discarded.
Secondly it goes without saying that any copyist is assumed to be untainted with any kind of moral turpitude and not acting in violation of any Torah law, or he would be summarily dismissed.
These guys were no different from a woman who eats ham sandwiches on Yom Kippur bringing out a kosher cookbook. No one who keeps kosher is going to touch it.
They did this in Egypt and there is a law in the Torah that Jews are not to return to Egypt. Anything they did therefore was automatically proscribed.
There is speculation that the Museum and Court in Alexandria ordered this but if they had, it would have done by professionals. The authorities in Israel did not order it because of the belief that the Torah is written in Hebrew for a Hebrew-speaking people living in one territory. And again if they had ordered it, it would have been done by professionals.
More than that, if the rule was that one flub ruins a Torah, what rules were they following? Anything goes. One horrendous mistake after another.
They even screwed up the first word. It does not say “in the beginning.” There is no suggestion of creation out of nothing. It says “at the beginning of....” and goes on to describe a process. It does not rule out pre-existing universes or other universes.