Give me break! By the time Satoshi wrote and sent his email the concept of hierarchicaly deterministic wallets (BIP-32) was not yet invented, nor was BIP-39 a thing. It's ridiculous to try to dig something from Satoshi's public messages and think he used it to derive his keys.

And it's proven that e.g. brainwallets based on publicly available data have been a recipe for desaster already.

There's first random entropy which is encoded into mnemonic words. The opposite direction is only used for a recovery. Just don't pick the mnemonic words by any human influenced ways, period! As @o_e_l_e_o said, you never pick mnemonic words by any humanish schemes, as that's usually a recipe for desaster.