Is "ALT" really necessary? I can't imagine anyone on this board that doesn't know the Star Trek 2009/Star Trek Into Darkness background?
It's probably not really necessary in this case, but all the other standard review threads (literally all of them, because we went through the backlog and renamed them) carry a label like that, and we might well see non-novelization novels set in the alternate reality at some point. It also means you can easily get a list of review threads ordered by the branch of the franchise they pertain to by sorting my little ranking table alphabetically by the title column.
Chalk it up to a slightly obsessive sense of order maybe?