[lifis]

Seems bullshit, apparently it only works with TPM-only mode, which is obviously insecure (it relies on neither the OS nor the hardware being exploitable, on a random Windows PC...), and not worth building a backdoor for.

The way one would backdoor something like Bitlocker is to encrypt the disk encryption key with a (post-quantum) public key for which only the backdoor owner has the private key for, and then put it on a place on disk that is unused by the filesystem.