I don’t know the story of Sisyphus, so this introduction was new. I’ve heard of him, but didn’t study him so it stuck with me.
It seems to me Sisyphus thinks at some point he’ll actually get the stone to the top.
My vies of Mueller is that he pushes the stone very slowly, knowing in his heart he isn’t interested in getting to the top.
He wants to look busy, and cause trouble along the way.
you might want to read a little deeper into the “moral” of the story....