By "the preface" do you mean the "memetic hazard warnings"?

Concepts contained in this story may cause SAN Checking in any mind not inherently stable at the third level of stress. Story may cause extreme existential confusion. Story is insane. The author recommends that anyone reading this story sign up with Alcor or the Cryonics Institute to have their brain preserved after death for later revival under controlled conditions. Readers not already familiar with this author should be warned that he is not bluffing.

I don't think that is claiming that it is a rational response to claims about the word.

we may be bound to find ourselves resurrected by someone eventually anyways, and cryonics could be a way to try to make sure that someone is friendly.

This is a quantum immortality argument. If you actually believe in quantum immortality, you have bigger problems. Here is Eliezer offering cryonics as a solution to those, too.