good luck to him to decrypt the persistent storage & then to find your wallet password before you recover your funds with your backups (you need to have no matter which kind of storage you use & you want them encrypted as well). nb : if using tails on pendrive he needs to get physical access to the pen drive not the pc, otherwise you use tails on virtual machine on the offline machine then the hacker also have to know you keep wallet on that VM before figuring out the different passphrases.