No straps needed. There is a pin sticking up covered in plastic that the spoke will contact to prevent the wheel turning in all the vids.
It looks easy to me, more so than a no-mar.
Adjusting the wheel holds are a bit of fiddley the 1st time or 2 until you look at the side rail and it gives you the wheel range (2 inch increments) so if you are working on a 17 inch wheel you set the blocks on the 16 to 18 wheel range size then rotate the 2 fixed cam blocks to the 3rd most open position. Try the wheel and you might have to adjust one cam block a 1/4 turn to compensate for variance in wheel size. The 17" bead is standard the outer lip of the wheel held by the cam blocks held can and will vary in diameter.
I've changed some wheels there the tire have been on the wheel for decades and was basically fused to the wheel. Not only do these tire have very little flex they actually leave rubber stuck to the wheel. They take a lot more force than working with newer tires. I'm not sure I'd want to trust a spoke resting against a plastic coated pin to keep the wheel from spinning. If you go this route I would encourage you to also fashion a coulple of straps to wrap around he wheel and frame of the changer to help hold the wheel from spinning and not risk bending spokes.
