"Don't you wish you had a job like mine? All you have to do is think up a certain number of words! Plus, you can repeat words! And they don't even have to be true!"

Dave Barry is making light of the job of a writer. He is recommending that all an author has to do is think up a particular number of words and that they do not even need to hold true. This is a humorous way of pointing out that composing is not as easy as it may appear. It takes a lot of creativity and effort to come up with the best words and to make sure they are true. Writing is a skill that requires practice and dedication. It is not something that can be done without effort. Dave Barry is suggesting that writing is a job that deserves having, even if it is not as simple as it might appear.