The whole argument to which is his stance make no sense.
In his way of thinking adultery, killing, stealing, etc;etc must be ok now.
If one adheres to one of those commands one must stone those who don't according to his rational.
You are right...when people are DISobedient to the Word of God they can not move on to spiritual understanding and are stuck in old ways that keep them prisoners. Jesus has opened the prison gates but unbelief/disobedience stops them from walking out. It takes a lot of BELIEF/courage to walk away from your own reasoning and TRUST IN THE LORD (of the Sabbath).