When analyzing the schematics in this SB the only conclusion which you can make is that only passenger reading lights are switched to an AC bus after switching the utility switches. The aim of the AD note is to remove power from IFE and other non-essential systems. As far as I know passenger reading lights are non-essential systems. By performing this SB the passenger reading lights will become an essential system. What if there is smoke in the passenger compartment caused by the wiring in the passenger reading lights? Pressing the utility switches in OFF will not solve this problem.