The phone was released with iOS 13 which prominently featured enhancements to USB restricted mode[1] which was supposed to defend against GrayKey/Cellebrite attacks. Seems like GrayKey can easily bypass that feature. Does not really inspire much trust in Apples security team as the USB restricted mode was already a bandaid itself.
[1] https://blog.elcomsoft.com/2019/09/usb-restricted-mode-in-io...