If you take Google's advice, you'll proceed with caution when it comes to using agencies who claim to offer guarantees in SEO. But it doesn't stop providers of this nature sending emails and making phone calls in huge volumes.
This infospamic is just a bit of fun, mocking some of the low quality services spamming business owners. But nonetheless, it's a tongue in cheek warning as well about using agencies claiming to offer something that sounds too good to be true in a rather short time frame and making claims of guarantees. If it sounds too good to be true, well... you know the rest.