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?"
(shrug) If encouraging people to read downvoted-to-oblivion comments is a minus, then there's a non-tidy benefit. Clearly, people differ in terms of how much they believe it is.
As for the same discussion springing up elsewhere... again, (shrug). If the convention of not having interesting discussions on hidden branches takes hold, and I want to respond to something on a hidden branch, I can respond on an open thread instead. But you're right that I might not do so.
By the way, I'm enjoying the irony here.