The JWs teach millions living in the past will gain salvation at the 2nd coming of Jesus Christ. The Bible contradicts that teaching

The source can be find here: https://www.jw.org/en/jehovahs-witnesses/faq/who-saved/ >Do Jehovah’s Witnesses Feel That They Are the Only People Who Will Be Saved? >No. Many millions who lived in centuries past and who weren’t Jehovah’s Witnesses will have an opportunity for salvation. The Bible explains that in God’s promised new world, “there is going to be a resurrection of both the righteous and the unrighteous.” (Acts 24:15) Additionally, many now living may yet begin to serve God, and they too will gain salvation. In any case, it’s not our job to judge who will or won’t be saved. That assignment rests squarely in Jesus’ hands.—John 5:22, 27." How do they reconcile this viewpoint when the Bible teaches that people received/gain salvation by believing in Jesus Christ as their Savior centuries before the second coming of Jesus Christ? Romans 10:8-10, "But what does it say? "The Word is near you, in your mouth and in your heart--that is, the word of faith which we are preaching, vs9, that if you confess with your mouth Jesus as Lord and believe in your heart that God raised Him from the dead, you will be saved; vs10, for with the heart man believes resulting in righteousness, and with the mouth he confesses resulting in salvation."