I think he came up with the idea originally, of using common words like this.
Because they really do have higher entropy, even if the attacker knows you are using common words and what dictionary you are using. Most modern systems (like bitcoin keys etc) use this idea now.
This is the reason (relevant xkcd) https://xkcd.com/936/
xkcd really has a comic for everything!
I think he came up with the idea originally, of using common words like this.
Because they really do have higher entropy, even if the attacker knows you are using common words and what dictionary you are using. Most modern systems (like bitcoin keys etc) use this idea now.