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This is incorrect. Modern cryonics does not use "freezing", but rather vitrification at liquid nitrogen temperatures (below -124°C), such that chemical reactions almost completely stop. (See the table at the bottom of this page and the section about the claim that "cryonics freezes people" on the Cryonics myths page.)
Thats very interesting, its obvious that cryonics isn't just a pseudoscience. But I can't see how a brain's electrical impulses and ongoing chemical reactions would be preserved and restarted, if they were ceased.
I don't see why you think there would be a problem. Raising the temperature restarts chemical reactions. Shine a light in the eyes or tickle the feet - that is all it takes to start nerve pulses flowing if the metabolic support is working. Restarting the heart is going to be more difficult than restarting the brain. That is to say, not difficult at all.
This is slightly misleading, since the difficulty is not in restarting the reactions, but in repairing the damage sustained between death and preservation, repairing damage caused by the preservation process, and undoing the vitrification itself. These are hard problems, but they are well enough understood that we think we can predict which research paths will eventually lead to solutions, and what those solutions will look like in broad terms.
The original comment didn't say anything about structural damage or toxicity, just electrical activity and ongoing chemical reactions, which are non-issues.
Right. I was assuming essentially no damage between death and preservation. Current practice is far from this ideal, as I understand it.