If the connections between neurons are lost in the process, then you have died.
Alcor’s FAQ has some information on the evidence indicating that cryonics preserves the relevant information. That depends on the preservation process starting quickly enough, though.
Why?
If it cannot work, then we would expect to find evidence that it cannot work, yes. But it sounds like you’re starting from a specific conclusion and working backwards. Why do you want to “prove [it doesn’t] work”?
Alcor’s FAQ has some information on the evidence indicating that cryonics preserves the relevant information. That depends on the preservation process starting quickly enough, though.
Because if it doesn’t, its a waste of time.