No. Many millions who lived in centuries past and who weren’t Jehovah’s Witnesses will have an opportunity for salvation.
CO Scotty Henry took great delight in asking the group meeting for field service if the WT answer in question about others than JW's surviving the Big A included people who are currently living. The Answer was NO, he pointed out the wording savoring the double speak. He loved pointing out how the WT gave such a "clever" answer.
Too bad for the householders that refused taking the literature, and said no to the Organization. In his explanation they had it coming for ignoring the WT.
What a WT tool this little man full of theocratic theatrics really is!