Spiritual progress is intensely personal and hard to measure, but the existence of anger in a person doesn't make that person "a bad Buddhist". It's not like Western concepts of religion where you're a bad $RELIGIOUS_DEMONYM or a good one. There are skilled people and unskilled people. Steve Jobs was using Buddhist teachings and practices to develop skills that most people don't have and that he probably lacked, to some degree, even unto death. No shock there. Getting to Enlightenment takes a long time.