The post is here. The reasoning as written is:

Cryonics is reasonable - Due to reading and understanding the quantum physics sequence, I ended up contacting Rudi Hoffman for a life insurance quote to fund cryonics. It’s only a few hundred dollars a year for me. It’s well within my budget for caring about myself and others... such as my future selves in forward branching multi-verses.

My comments on the subject (having cut out the tree debating MWI) can be found here.