If they had shown Paradis getting nuked I would believe in the apocalyptic scenario, but it's very unlikely that a nation has the power raze every enemy city while they are being razed to the ground at home through standard military means.
I don't think it's reasonable to think that the world met the same fate as Paradis. You'd have to imagine that a lot more years have passed and the remaining nations warred among themselves or some other catastrophe happened, however there's really not much that suggests that.
The most likely interpretation is that the kid was part of a small group of Eldians that somehow survived and kept living in secrecy in Paradis, without any contact with the rest of the world.
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