The selfie is still a composite image. The camera arm is attached to the left front corner. Any image of that corner would include the arm.
Swing the arm left and take a picture of the right half, then swing the arm right and take another picture to the left. Put the two pictures together and you have the whole machine, without the arm.
If you swing the arm right and take a picture of the right, the arm would obscure the shot.
edit: I guess the arm is not on the wheel, but the corner of the main body.
[This message has been edited by williegoat (edited 01-27-2020).]