The author is mistaking the Masoretic Text, a 4th-century publication with the actual bible.
Following the death of Christ and the destruction of the Temple, the Jews held a council at Jamnia to decide why God would unleash such horrific punishments apon the Jews as they were then suffering. They decided that Jesus had exposed the dangers of Hellenistic thought creeping into Judaism, so to obliterate any traces of what they considered the heresies which led to Jesus, they removed the portions of the bible which most directly pointed to Jesus.
But the real Old Testament did consist of the three parts mentioned. The three parts are referred to as the Law, the Prophets, and the Writings. And among the Writings existed the books which the Jews expunged.
Interesting note: because the Pharisees didn’t consider the Writings on an even level with the Prophets and the Law, Jesus rarely quotes any of the Writings. The one exception was the Book of Psalms, which is the most quoted passage, and which may have been considered one of the Books of the Prophets.
Excellent very few recongized the influence the Hellenist had and corrupted many sacred things of the Lord.