These two possibilities, in terms of the ultimate outcome of human civilization, actually make no difference.
It's worth "savoring" Einstein's so-called "most beautiful future" to see what he really meant.
If Einstein's answer is: a dozen, a couple dozen people.
That would mean the world-ending white light at 00:42 didn't occur, and so people could still survive until 10:00 in the morning.
Furthermore, it would indicate that the future Einstein saw, and the future I dreamed of, are roughly consistent. If there are a dozen survivors in an area as vast as Donghai City, perhaps I've simply overlooked some. We'll just do another comprehensive search next month to make sure.
If Einstein's answer is: a very large number, hundreds of thousands, millions...
Then it's self-evident.
[The future Einstein saw and the future I dreamed of are fundamentally not the same thing!]
[Between the two of us, surely one has seen a false future.]
As for which one is false...