Well, the belt arrangement is what differentiates between the CoreXY, the HBot and the Sli3Dr gantries. HBbot has a problem with causing the x-axis to try to twist out of position and on a flimsy frame (like you would find on many Reprap builds) can rack the entire frame out of square. Sli3Dr has completely seperated x and y axes, making it run on standard Cartesian coordinates, but it also uses double the length of belt that the CoreXY does, allowing it to strech more over time.

All that said, the placement of the motors on their respective belts in a CoreXY is totally interchangeable, and the belts on this are indeed in the CoreXY configuration.