There are questions we should ask. Was there ever a master copy of the OT? If so, where was it kept?
Since much of it (the Pentatuch) predates a written Hebrew language, the Master Copy was an oral tradition. It was transcribed after the fact. After that was done, the best candidate for the master copy would be those kept in the Ark of the Covenant, so it is long lost.
If you want word for word accuracy, sorry, it's no longer possible. Nor would it be possible when reading a translation, because there is not perfect agreement in vocabulary, grammar, etc. between languages (especially when there are multipel translations: ancient Hebrew, to Aramaic, to Latin, to the archaic English of the KJV, to the English we speak now.)
But if you want the meaning of the message, it is there. As the article noted, it extended the conventional text, it did not replace or contradict it.