Upon rewatching it, you realize how a great deal Sanji intended it when he said that he owes Zeff "a hell of a great deal". All we know is that it didn't have spaghetti in it, but it experienced "Penis Music". The runes were not intended to be deciphered until eventually the release of the previous BD, the place the jacket would have the exact lines as the nearly-final display of runes, in basic letters (a scenario of Rosetta stone, that is).