In universe, it's a coincidence. He's using the same TNG stardate system, and it was not Earth year 47988 in All Good Things.Spock's ship also gives "Stardate 2387" as it's commissioning year. The evidence is incontrovertible.
Also the jellyfish never said the word year, just commissioned stardate 2387.
Stardates are created by an unknown (to us) process in universe. Out of universe we have orci's new rules for kelvin movies from interviews that coincidentally match earth years in key instances , but the correlation at all times is not canon and orci's ruleset is never stated on screen
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