Basically, it means that the tuner of the G string isn't fitted exactly where it was supposed to be. That may influence tuning stability a little, as well as how quickly the nut wears down.

However, "does not bind other tuners" means it won't get in the way when tuning the other strings.
Ceci n'est pas une signature.
I think that just means it doesn't get in the way of the other tuners. Probably just drilled in the wrong spot and looks a little off. Functionally it's probably fine. Email/Call them and ask.
Quote by negative1
It means don't pay full price for the guitar.

There's already a discount on it compared to the "good" ML-2's.
Ceci n'est pas une signature.
If you look at the back of the headstock, usually the tuners will all be lined up with each other. What they are sayins is that the G string tuner was mounted crooked so that it is not perfectly in line with the others, but it won't affect the tuning or other tuners in any negative way.
pics of gear updated on profile 11/16/09