In that diagram, the TE is laid out in the very top. The buttons are on the left side as they are meant for looking at the joystick from the back, where you would end up seeing the 4 pin harness cable and therefore the buttons are on the left side and not the right side.
edit: that diagram is quite moot actually when it comes to the round 2 TE pcb as the directions and what signals they are are laid out plainly on the PCB itself