I get that, and yes he is.
Like Odin says, you're supposed to clarify with the DJ or LJ, the reason being that he or she can see all three points of the imaginary line - the receiver's toe, the ball, and the down marker on the far side. The receiver theoretically can't accurately see his own point because he's standing over it, so his only two reference points is the ball and down marker. I'm not really saying the guy couldn't have or shouldn't have known (or at least set a yard or so behind), just that he's getting dragged a little unfairly for not seeing something that would be obvious to someone behind him but not necessarily obvious to him.