1. The Orthodox Study Bible was competed a few years ago—I own a copy. So this article is old.
http://orthodoxstudybible.com/
2. Whether there was a Council of Jamnia is now controversial.
http://en.wikipedia.org/wiki/Council_of_Jamnia
Nevertheless, the Jews rejected the Septugint around that time.
3. The author of this article, Daniel (not David) Lieuwen is a great friend of the Serbs.
The Jewish version is that the original Septuagint was the Five Books of Moses only, and none of it survived. The term was then borrowed by Christians to intentionally confuse the history and lend credibility to their revisionism.
And it is mere fantasy that the Council of Jamnia ‘fixed the canon’. There was discussion about what role Aramaic rather than Hebrew could be used and still be called inspired. The canon was fixed after the First Exile. And that’s skipping the major difference between the Jewish view that the Five Books of Moses are primary, with the Christian view that later revelation is primary.
Jews see a natural continuation between the Tanakh and the writings of religious Jews that followed (the Mishna and others), while Christians believed Greek became God’s language.