MikeJW You're not providing enough evidence to show that this is their new teaching. The one statement you mention doesn't substantiate it at all.
In the Watchtower, which include part of what you quote it states
But a person’s eternal future does not depend on when he happens to die. Jehovah is the perfect Judge—he renders just and righteous decisions. (Read Psalm 33:4, 5.) We can be confident that “the Judge of all the earth” will do what is right.
These comments are loaded and they won't explain any further on it because they just don't know or have chosen not to say.
However, it appears that what the Watchtower is saying is they don't know what will take place (and God will be fair and just) but they do know that if a person was going to have eternal life after they were resurrected then that person would not be killed at Armageddon had they still been alive at the start.