[svat]

It looks like you're talking about just the phrase “how about never?”, but the full text of the cartoon—the quote attributed to him—is:

> No, Thursday's out. How about never—is never good for you?

It's the whole second sentence that is funny/memorable, and when he says that the phrase is entrenched in culture, that's the part that is meant, e.g. with the quoted “They said to the president, How about never? Does never work for you?”.

(BTW in case it's not obvious from the article, when the title says The Story of “How About Never” it means the story of the cartoon known by that name, not the story of the phrase itself.)