[ignoring the evidence and assuming for the sake of argument that it was done by aliens who can act physically on Earth somehow]
So why would they use that to make large, complex marks in fields? If they wanted to communicate, they could do so far more effectively. If they wanted to remain hidden, they wouldn't make large, complex marks in fields. The binary message one assumes that not only can they act physically on Earth, but they also understand binary, the ASCII standard and English and probably the way that optical discs work (since the pattern mimics an optical disc). If for some reason they thought that was the best way to communicate, why such a message? Why not "Greetings to the people of Earth from <whatever they call themselves>" and a message that means something? Why not instructions on how we can communicate with them? Even if that's with binary crop circles, they would at least tell us where to make them. "Leave a message in the field next to this one", or something.