Any attempt to get physical access to the internals of your PC will delete the cryptographic key, rendering all your data permanently inaccessible!
This is more or less the dream of any saboteur/bad guy, a built-in, automatic way to destroy your data, in practice IF they get anywhere near the device, they will be in the perfect position to blackmail you and ask a ransom.
It also is the first PC in the world that is truly an appropriate base for storing the private keys of any block-chain based currency you may own, rather than keeping them with a third party.
"Gimme 1000 bucks or I will crack open your new, smart, PC and you will loose all the zillion Bitcoins you have in it."
With a "secure", "failproof", "strictly followed" backup strategy it may even work, it only remains the issue that a "secure", "foolproof" backup strategy dos not exist, and even if it will exist, noone will follow it strictly or strictly enough.
If the thingy gets "traction", the same people that were (are and will be) "bitten" by improperly or unneededly using disk encryption will be all over the place whining they lost all their data....
It may, actually may, be a solution in the Public and/or Corporate world, to make physically exposed to the public (think of all the times you were left alone in a public office or bank office with a running, not locked, PC for a few minutes facing all those ports at the back of the case ... ) "terminals" secure from tampering.
A few years ago presumably secure (actually totally UNsecure) "keyfobs" were all the rage and soon they "disappeared", if you remember them:
But they made some sense, when they they locked the PC when you took the key away, preventing the "occasional" access by third party if you forgot to lock the PC, as well I remember some (I think it was a Vectra HP PC) with a switch that sounded an alarm when you opened the case, which could be another way to "tamper-proof" a PC, but deleting the crypto key on any physical attempt reminds me more of "Mission Impossible" than anything else.
 and no, before you say anything, "the Cloud" is not "secure" nor "failproof".