Bullshit.
You most certainly can. Not with the rope running through your gear, but if you clean your gear on the way down, a 60m rope reaches just fine. But why would you do it that way? Just belay up the second from the top and then rap off.
You are correct. You'd have to clean on the way down, which my partner did not do. Yes, I would have preferred he belay from the top, but he wanted to get out of the sun.