Hebrew isn't the original tongue for some of the Old Testament, there's Aramaic too. What they are using a codex which dated back to less than a thousand years ago, well after any Biblical era.

Then we also have to contend with what the Patriarchs spoke, was it Hebrew? doubtful, the oldest hebrew inscriptions don't go back to the time, of someone like Moses (if he existed), much more like around a thousand years BCE. So at best, they are using the books of the bible which were compiled under Ezra, and later on, more parts were added, and added again, such as the book of Daniel. So how can a code be written into a book which has been through so many human hands, moulding it to suit the needs of the day.

It's all nonsense, and this code has been debunked so many times.