Jesus said it would come as a thief in the night. Evidently, Jesus meant that it would come as a meeting at the Kingdumb Haul.
It would be interesting to ask the CO if he meant that the attack on Babylon the Great would begin when the witnesses were at the Kingdom Hall? Because the troof teaches that armageddon begins after the tribulation and the attack on religion, and after a grand and notable cry of peace and security. So it's not like a meeting next week is going to announce "Armageddon begins now and only those in this building would survive." In the story, there were 10 plagues. It wasn't a case that Moses came back to Egypt and met with the Hebrews in their Kingdom Halls and explained during their service meeting that there was only this 10th plague, and there wasn't going to be any announcement to the Egyptians. Nope, the story is that after the earlier plagues, there was warning to everyone when the 10th was coming and what to do.
There is a long list of things yet to be fulfilled before armageddon begins. The old teaching was that false religion would be attacked, and JWs would be attacked but would be able to continue to meet in secret with their congregation book studies. That's sorta been scrapped, eh? In the case of his new story, wouldn't the government agencies be able to go to the KH and round up all the JWs in attendance and exterminate them? In which case, the JWs that met secretly away from the KH would be the ones surviving the tribulation and armageddon.