Here's an example of why DaveScot should not be taken as anything more than a troll. Witness this comment about Mark Perakh:
Mark Perakh is a crazy Russian physicist known to say all sorts of crazy things. Russians are notoriously paranoid conspiracy theorists and bald faced liars. My favorite example was when I questioned his credentials and his response was essentially "the communists took my papers". Evidently Mark doesn't know the classic American excuse "my dog ate my homework". I had a field day with that one.
In this case, it would again appear that Mark's proof disappeared in an unfortunate circumstance beyond his control. A mysterious software glitch in Amazon Canada magically and momentarily revealed the name "William Dembski" behind an anonymous reviewer's handle. Wow! What're the odds? At any rate Mark's "the Canadian software ate my proof" is par for the course for this guy.
The short answer is Perakh, like a million other lunatics, doesn't deserve a response to his paranoid accusations.