ALL Commercial computers were
carefully and purposely manufactured to be accessed by the NSA or government entities.
Either by allowing substances to be discovered to build them out of so they could be accessed, or implementing guidelines by regulation that the physical properties would facilitate access.
Either way or both, not a commercial computer has been made that cannot be accessed, on or off.
This kind of reminds me of the device found planted by the USSR in the Great Seal only in it's mystery level. "The Thing"
The implications here are vast, from decades of specific population control to alien technology.
As we all must assume, anything that's available commercially today was likely used by our government to some degree 30 years ago.