I find that message misleading. The xkcd comic does have a point, and thus should be taken seriously. (Despite the obvious downside that those passwords take longer to type, which is why I still prefer short, cryptic passwords.)
Its saying dont use that particular password. Any attacker of this script would know what it was inspired by and attempt that password in a dictionary.
Rendering it about as useless as 123456789 in this instance
So a better message might be:
"Don't follow the webcomic too closely. :)"