By the way, I completely agree with you, although its not a popular one. If it was time travel, the Kelvin movies absolutely wiped out the prime universe - so unless it was an adjacent universe instead, then one must assume that there is an unseen "closing" chapter to the Kelvinverse, most likely a Very Old Spock stopping the destruction of Romulus on the second time around, negating Nero's time travel to begin with, and snapping the Universe back to Prime.
If the Kelvin universe wiped out the prime universe, then Star Trek: Picard wouldn’t exist.