He says from OUTSIDE Icon range, means that the GV should be hidden. He also says a Neon Green square, meaning it would have to be a friendly, but he then says he enjoys killing them. Makes me read as if he sees the green square, knows its an enemy and gets the easy kill.
I would say, all counting im correct, that its a bug
I've always been able to see GV's well past icon range. You have to have every graphic slider turned all the way up. (I think anyway, mine always are) You can usually see a tiny speck moving along. Yes M3"s I see as neon too, sure makes it nice when searching for them.
Seeing the GV's from way out I don't think is a bug, it's dependent on your system and graphics capabilities. However the neon green part may be a slight miscalculation somewhere.
I'm sure an AH fella will come along and set the record straight at some point.