We differ on the probabilities. If you think of the brain as a biological computer then saying freezing is hopeless is a bit like saying keeping the hard drive from a broken computer is hopeless because you have zero chance of ever getting the data off.

I think most "believers" in cryopreservation would agree that it's a long shot. Even if restoration is theoretically possible, a lot of things need to line up for it to actually happen for an individual. But as you say, there's a significant difference between unlikely and impossible (which I'm going to assume is what was meant by praying to Zeus). The hard drive probably has rather better chances than the frozen brain though.