You seem to be suggesting that the knowledge physicists have about cryonics is based on their generalist knowledge as educated layment. You further observe that much of this knowledge comes from fictional evidence in popular culture. I heartily agree.

The existence of cryonics is common knowledge. You just need an internet connection to look up the details.

Physics and mathematics. My comment doesn't suggest otherwise. This does not mean that all physicists are particularly well versed in it when it is not their area of expertise.

Still I expect them to be more proficient in it than random people who use the term as a buzzword over the interwebs.

Neuroscientists are not experts in extracting one to one mappings from preserved brain tissue to individual identities.

While the people who would keep you on dry ice for two weeks obviously are.
You are making classical crackpot excuses to handwave away expert knowledge. I don't think there is any productive way for us to continue this discussion.