*w60 2/1 80 - 17 There may be rare instances where a child is so hardened in its stubbornness that even the rod of correction cannot drive it out. In the days of Israel parents were instructed by Jehovah to take such a rebel to the city fathers and they, in turn, took the incorrigible one out and stoned him to death. There were no juvenile delinquents under such a system. (Deut. 21:18-21) So also today, the New World society of Jehovah's witnesses can not and will not tolerate juvenile delinquency to exist in its midst. So, to avoid a possible death-dealing blow by being disfellowshiped from the congregation.
Or WT 1952 11/25 p. 703
Being limited by the laws of the worldly nation in which we live and also by the laws of God through Jesus Christ, we can take action against apostates only to a certain extent, that is, consistent with both sets of laws. The law of the land and God’s law through Christ forbid us to kill apostates, even though they be members of our own flesh-and-blood family relationship. However, God’s law requires us to recognize their being disfellowshiped from his congregation, and this despite the fact that the law of the land in which we live requires us under some natural obligation to live with and have dealings with such apostates under the same roof
From this I understand that disfellowshipping that the person should be treated as if they were dead and continues that concept by saying thus a disfellowshipped person should not be spoken to or treated like they are live. I wonder if they still believe this.