I can't imagine how you can paraphrase 12, or even 24 words, and carry it all in your head. Probably, this person should have a phenomenal memory and confidence that nothing will ever happen to him. Although, can we know what awaits us even in an hour?
How often do we meet people who invent ways to store their seed phrases that are so stupid, and they subsequently suffer from their inventions? Everything simple has already been invented a long time ago; there is no need to go crazy.