In any case all agree that the LXX was completed and that includes the Law, Prophets and Apocrypha by 132BCE. Which is, of course, the point.
Negative, the point is alma means young woman. Everything else is a contortion. And you can’t pun it on the sanctioned 5 Books translation.
We’ve no idea if the Christian Septuagint was ‘completed’, as there are no existing copies from near its date of supposed composition.