Brian does not say anything of the sort. He just states that injury produced by chemical fixation is worse than that produced by (straight) freezing.
Since he also wrote Alcor's technical FAQ on chemical fixation, it would make sense to look at this as well:
http://www.alcor.org/FAQs/faq02.html#cryopreservation
"Also, fixation commits patients to a very high level of future technology for revival".
Note that this sentence does not say anything about the impossibility of resuscitating chemopreserved patients. As a matter of fact, I am not aware of any serious cryonicist who has claimed that resuscitation of chemopreserved patients is not possible.
