The text is saying that abusive boss is no better than unbeliever, and shall be punished by God. Do you disagree with my interpretation?
Not the boss, the slave. The slave is the one to be punished as much as the "unbeliever". This isn't about punishing the boss, it is about punishing the slave for goofing off while the boss was away.
46. The lord of that servant will come in a day when he looketh not for him, and at an hour when he is not aware, and will cut in sunder, and will appoint his portion with the unbelievers.
The slave is to be punished as though he were a non-believer. So, non-obedient slaves and unbelievers are in the same class. Chris, you listening? Others may argue but imo subjecting people to slavery - and then punishing them for being disobedient to their masters IS advocating violence.