A rule that is not listed in any rulebook never gets called, and never gets run. So creating your own rule, and then saying that it is not listed in any rulebook, is not going to accomplish much.
What you really want to do is find out which already-existing rule causes the “currently switched off” message to appear, and then unlist that rule. heartless zombie has already demonstrated a quick way to do this, showing that the rule responsible for that message is called the “examine devices rule”.
The examine devices rule is not listed in any rulebook
…will take that rule out of play. You can also say:
The examine devices rule does nothing.
…which does pretty much the same thing, but allows you to attach conditions. For example:
The examine devices rule does nothing when the noun is the TV.
…suppresses the rule for the TV, but not for other devices.