to the best of current knowledge the frozen bodies are irreversibly dead irrespective of any future scanning or simulation technologies
I do not believe this individual is in possession of the best of current knowledge or at all capable of judging the capabilities of all future scanning or simulation technologies.
One of the local junkies speaks again... Look. Most neuroscientists do not think it works. Most physicists do not think it works. You have to pick that careful ground in the middle where you are trusting cryonics organization (literal scams run by unscrupulous individuals who gone as far as to have people make the last wish to be freezed after weeks on dry ice!) and not people with measurable success at making something actually work. The reason it doesn't work is that there is extensive chemical damage, i.e. the state information of proteins, protein adhesion, and so on, is lost irreversibly. It is almost as implausible that it works as if you literally cook the head in a pot for an hour or two prior to freezing it.
In the past, the Cryonics Institute has had a policy that said that they would not accept anyone who is not a member. This has changed. The policy now is that someone who has full legal authority over your body can sign you up after you die. It costs $36,250 to be frozen if you are not signed up, which is more expensive. They also will not do anything until you have been on dry ice for 2 weeks after they have been contacted, so not being a member is more risky.
This is very important news for anyone who is currently cryocrastinating. It means that you can drastically increase your chances of survival without filling out any forms. All you have to do is tell a loved one you want to be frozen upon death, and that you would like them to take responsibility for making sure this happens. This takes literally 30 seconds. Do it now!
This news might also be a reason to not sign up right away, if you think something better (like radical life extension or uploading) will come along in your lifetime. We should discuss this in the comments.
Edit: The general consensus of this discussion is that this is a really bad reason not to sign up for cryonics.