You know, it's possible to admire Tim and his work and still feel that the general style, this entire genre of books has jumped the shark.
Taken like that, it's not an attack, just some gentle ribbing. And it's not even directed at Tim per really -- it's the rest of us who eagerly buy into such over the top nonsense that's really being made fun of.
(I haven't read the book or know from Tim. But I'm very familiar with this style of writing. In my 20s I bought all sorts of these books and tapes, so this style has been around for a long time)