The issue is that it’s a controlled video from the author. I can still get Wi-Fi and Bluetooth in airplane mode so the airplane mode sign isn’t “proof” enough for me to accept the paper conclusions.
I hope it’s real, but posting a YouTube to assuage the “show me the implementation” isn’t going to help with my cynicism.
The paper describes the implementation including a detailed breakdown of the optimisation algorithm itself.
It's also plausible an iPhone 14 Pro could do it given its memory b/w, ops/s and that it can fit the SD model in RAM.