You are right there is a contradiction between claims that the text has been transmitted accurately and the claim that the divine name stood in the original. So what? ,,,,,
If that means the text has not been faithfully preserved, then so be it.
How much it matters depends on your viewpoint.
From a secular standpoint, I agree. Let the chips fall where they may.
From a religious standpoint of someone that would consider the writings to be sacred and "inspired", the implications are greater.