The fact they supposedly recovered 15k Bitcoins tells me he wasn't sophisticated enough to secure his private key sufficiently. If he had memorized a BIP39 mnem

The fact they supposedly recovered 15k Bitcoins tells me he wasn't sophisticated enough to secure his private key sufficiently. If he had memorized a BIP39 mnemonic for his private key we wouldn't be reading about $162 million dollars worth getting seized. Brain wallets are pretty tough to crack.