The Aftermath: Because the encryption keys are already instantly nuked at the hardware level, the phone boots directly into the Google Pixel recovery or factory-fresh setup screen.
It's exceptionally apparent you've caused destructive behaviour, after the phone is in evidence.
None of the other scenarios, show your duress pin factory resetting the device, then dropping into a setup screen, after the border agent confiscated it. So much of tbe law is intent, coupled with knowledge of your situation.
There's nothing new here really. Throw a diary into the fireplace at home? Fine! Travel with a blank diary? Fine!
Grqb it from a border guard and and rip it up? Trouble.
It's not about the state of the device at the border. It's intent to change the state after confiscation.