I'm thinking, that the current "Prime Universe" that they use in new Star Trek series is not the "Prime Universe" that used by TOS in the '60. The entire universe has change after Star Trek Enterprise, and then goes into Star Trek Discovery and then Star Trek Strange New World.
So even if Star Trek Strange new World goes directly into the Kirk era again, it still not Star Trek TOS. Because they are basically happen in different universe, despite claimed to be Prime Universe. Or maybe, the Prime Universe follow Star Trek Enterprise, while the TOS universe stay with TOS universe? I don't know.