A brief line from this comment indicates that the author of the cryonics-critical comment quoted here was perhaps not the one that deleted it.
You know what - I am rather glad my comment was deleted on less wrong - good reason for people not to post on there.
Was it deleted by a moderator?
Honestly, the decisive downvoting seemed to do the trick of hiding it from casual readers who don't want to see the long annoying rants. I don't think it was casting any doubt on the credibility of cryonics.
While it sounds like the author regrets posting it, I would think they should be allowed to delete it themselves.
Edit: Originally titled "Cryonics critical comment deleted?"
The way to avoid contributing pagerank is rel=nofollow.