Is what these scholars say true?
No! Considering that the children of Israel would spend several generations in captivity to foreign powers, it is of little wonder that some texts would be written in the language of our captors. This explains the texts which are written in the language of the Assyrians and the Chaldeans. Also keep in mind that the scriptures chronicle all the captivities of the children of Israel from Egypt (Moses) to the Romans (Christ). Why then is the entire Greek captivity excluded? The answer is simple, it was not excluded! It was recorded in the biblical text mistakenly being called the Apocrypha.
What does the Bible say about those that would exclude the Apocrypha?
Revelation 22:18-19 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: (19) And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.
The texts that are now called the Apocrypha were originally considered part of the bible. The original 1611 version of the King James Bible contains these books. However, men took it upon themselves to “take away from the words of the book” thus disobeying Christ and bringing damnation upon themselves.