I said that because it seemed he was giving the pat, standard, "I haven't thought about this" answer. I don't know if Tyson is sloppy in all thinking outside the lab, but he seemed to be sloppy here. I wouldn't mind if he disagreed with cryonics after having examined the issue in detail, but he's giving an answer (seemingly) without having thought about it very much.

In short, I think I mostly agree with you.