It doesn't need to be 100% accurate to your standards and satisfaction to be funny.
Most of it doesn't even contain a single grain of truth. Good comedy is always based on something truthful so it can connect with a general audience. This is "comedy" based on propaganda so it only appeals to NPC types like you.
Peterson is an idiot. Taking the piss out of him is funny.
Yes, any idiot can write a book that sells 2 million copies and counting. How many copies have your books sold??