Contrary to popular belief, undisclosed location doesn't mean that the place isn't known or told. Instead it refers to the city Dis in Hell.
Un-dis means that the location isn't in the city itself.
We know from the first principles and mathematics that dis-closed means that the place is in the closure of Dis. Putting these two concepts together to the word undisclosed we realize that the person who is said to be at an undisclosed location is in fact smeared as a very thin layer on the city wall of Dis.