Many of the "prophecies" in Scripture were written so that those in the events depicted would not recognize the fulfillment until after the fact. However, the resemblance to the prophecy was meant to edify the believer and help convince the unbeliever.
I have not studing the results in Hebrew directly. I have written some code to attempt to find similar effects in English texts and found none. It could be that Hebrew is structured such that chance occurrences are more likely. However, the "experts" who have examined this phenomenon have compared results with other Hebrew texts and not been able to locate similar effects in non-Biblical texts.
I don't know what to believe about it, but it does produce some startling results. Go look at the site!
Remember that the Dead Sea Scrolls demonstrated that the current Hebrew texts are EXTREMELY faithful to the originals. Else, this whole train of thinking would indeed be specious.
Hebrew letter have been used on Tarot cards. Did you know that ? Their meanings have been said to be extreemely accurate. Hebrew letters are also used on dradels ( sp ? ), which children play with during Hannuka. When the toplike object stops, the Hebrew letter showing is their " fortune ". Then, there is the Kabbala , in which Hebrew letters are used to work esoteric works. Hebrew letters were also used by alcamists . The " BIBLE CODES " aren't even as accurate as some of these things are , in telling what will ( or in the CODES" case, LOL ) , what HAS already happened.