Not the GB specifically, BTW… current WT dogma has them being raptured taken away prior to Armageddon starting, to lead the Heavenly armies against the wicked Worldly hordes (😒)…
…but that is essentially what they’ve said, distilled down to its simplest expression; that the Warwick compound and its outlying facilities will be used post-apocalypse to act as steward in the New System (and witness to/convert the newly-resurrected)…
…i.e. rule the planet.
‘Course, all that’s up in the air these days, as they seem to be rewriting WT theology on the fly, so who the fuck knows? 😏