No, word length has (almost) nothing to do with it.
XKCD assumes each word has, regardless of length, 11 bits of entropy. It implies that you are picking up each word out of a dictionary of the 2^11 (2048) most common, non-trivial[1] words. And truly, example words are common: correct, horse, battery, staple.
Contrast this with the "classic" example. You pick a single base word from a larger list (16 bits of entropy == 64K-word dictionary) of longer, more complex (troubadour, 10 letter long) words, and then subject it to a number of transformations to pump its entropy another 12 bits.
The key insight of this piece is that attackers have moved over to techniques that make password length a poor estimator of its entropy level. It is the rarity of the base word that makes the lion's share of a password entropy, with length adding marginal improvements, mostly from the increased chances to pack more transformations into it.
This gets lost on the discussion of the comic's main thesis and less subtle insight that it is easier to add entropy by increasing the number of base words than by adding transformations to a single base word.
[1] I am removing trivial words of length < 4 because if you choose from them, you may end up with a password with length between 4 and 12, which may be brute-forced without regard for dictionary attacks now or in the near future. Shortest word in the provided example is "horse" which is weak evidence in favor of this hypothesis.
XKCD assumes each word has, regardless of length, 11 bits of entropy. It implies that you are picking up each word out of a dictionary of the 2^11 (2048) most common, non-trivial[1] words. And truly, example words are common: correct, horse, battery, staple.
Contrast this with the "classic" example. You pick a single base word from a larger list (16 bits of entropy == 64K-word dictionary) of longer, more complex (troubadour, 10 letter long) words, and then subject it to a number of transformations to pump its entropy another 12 bits.
The key insight of this piece is that attackers have moved over to techniques that make password length a poor estimator of its entropy level. It is the rarity of the base word that makes the lion's share of a password entropy, with length adding marginal improvements, mostly from the increased chances to pack more transformations into it.
This gets lost on the discussion of the comic's main thesis and less subtle insight that it is easier to add entropy by increasing the number of base words than by adding transformations to a single base word.
[1] I am removing trivial words of length < 4 because if you choose from them, you may end up with a password with length between 4 and 12, which may be brute-forced without regard for dictionary attacks now or in the near future. Shortest word in the provided example is "horse" which is weak evidence in favor of this hypothesis.