This is correct.I believe that breaking up pallets is how UPS World Ease works, which is the product Apple is using to ship these. Everything is individually addressed in China, but then it's bundled up for shipment and customs. Once it hits Louisville, they're broken up and resorted for their destination.
https://www.forbes.com/sites/ups/2017/06/21/take-these-six-steps-before-going-global/#3130c43c775b