…no? If you follow the scheme the person is suggesting, 80 bits of entropy is 80 bits, and it will take 80 bits "worth" of brute-force searching to crack a pass

…no? If you follow the scheme the person is suggesting, 80 bits of entropy is 80 bits, and it will take 80 bits "worth" of brute-force searching to crack a passphrase during such a search. If you're literally choosing "correct-horse-battery-staple", yeah, it's just a slightly harder dictionary attack, but that's not the suggestion being made, and that's not different than choosing hunter2 as a password.