There’s different levels:
- Shutdown at UEFI splash
- Long press power button
- Unplug PC
- Turn off PSU
- Turn off extension cord
- Turn off room’s breaker
- Turn off main breaker
- Cut off the power lines
- Shutdown the power plant
- Declare war on any community using electricity
- Declare war on thunder clouds
- Destroy everything with electrons (total annihilation of the world)
2nd is also important in that your phone is always connected (unless in airplane mode) to some cellular network, and can still be tracked the same way (unique IMEI).