Hey I'm very sorry, at this moment it is a game bug and my oversight, the player bed gives the wrong message and the storyline ends with the discovery of those 4 letters, which will not happen again because it is already fixed and it will enter with the next update.
I am very glad that you managed to decipher it manually, it is for players like you that it is worth adding this type of elements to the game enriching its world, I have already discussed this with others that although this type of element is more of a curiosity and spoiler of some elements of future storylines, in the future there should be a reward for players like you in the game for this type of action, at the moment it is only a plot element of which there will be a lot in the game, and there is not much of a reward for it so as not to disrupt the discovery of the other letters in the next story, nevertheless I will work on it so that some side reward you know, we will be able to write on the keyboard in the game so that Eli will know right away what is in the journal and we will get something for it, an additional scene, maybe her other plot line I already have a lot of ideas but it is in the future. Anyway all this I will discuss with you whether here or on discord because I am always open to ideas.
But I'm very happy, I thought I'd rather not find players who would want to play this decryption before the game becomes popular, and before everything is already decoded in the game through tasks. I myself like such elements in games so I hope you enjoyed it even though it's quite a small element so far.
And thanks for giving this game a chance ^^