Tetsuya Nomura acknowledges that Kingdom Hearts 4 is more like Kingdom Hearts 13, but the story's gotten a "reset" to keep new players from getting confused
Kingdom Hearts 4 will, notably, not be the fourth entry in the famously convoluted lineage of the series, and director Tetsuya Nomura knows that all the backstory is intimidating for new players. That's part of why there's been a story "reset" leading into the new game.