I can't help but think this person is over-analyzing. I mean, other things happen that simply don't make sense if you think about them literally. The vestibules have bathrooms, but there's no indication of where food or water comes from. At one point a sect is mentioned that burns millions of books, but there's no mention of how they were able to start fires. The dead are apparently thrown out of the hexagons into an infinite fall, but there's no explanation of what part of the library's structure allows this to happen.

Borges often toyed with literary formulae, frequently created impossibilities, and in one case (Pierre Menard) explicitly lampoons exactly the kind of analysis that the author here is doing. Who's to say Borges didn't make the "correction" for the sole purpose of screwing with nitpicky readers?

To me, the story is an absurdist one (in the philosophical sense). If everything's already been written but there's no way to find the specific thing you're looking for, how do you find meaning in this universe? He describes various cults and governments that have formed. The narrator tells us that he's been searching for the book that will lead (through a chain of other books) to some kind of master book; if that's not a search for meaning I don't know what is. Then he goes on:

It doesn't seem implausible to me that on some shelf in the universe there is a complete book; I pray to the unknown gods that a man - just one, even if it was thousands of years ago - has examined and read it. If honor, wisdom, and happiness are not for me, may they be for others. May heaven exist, even if my place is in hell. Let me be ridiculed and destroyed but that sometime, in one person, Your enormous Library be explained.

Another discussion of meaning follows a short time later:

Some number n of possible languages use the same words; in some, the symbol 'library' has the same correct definition: 'the omnipresent and everlasting system of hexagonal galleries,' but 'library' means 'bread' or 'pyramid' or whatever else and the eight words that define it have some other meaning. You, who read me, are you sure that you understand my language?