A hard drive works on a different principle. I believe that when you delete a file on a hard drive, all that happens is that you delete the index to where the file is. Sort of like tearing out the table of contents in a book. The info is still there, you just don't know where it is.
It may not accurately represent the Japanese as a whole, but it may accurately represent some individual soldiers. From that point of view, I wouldn't necessarily call it revisionist, just showing a part of the war that we are not that familiar with.