I think that you are making too much of Dr. Z.'s words. If the transcript is accurate and was taken from a recording of an interview it's easy to have a slip of the tongue and say 'deaths' when he meant to say 'death'. Even if he was writing responses to the questions, people make errors even when they know the facts.
Dr. Zivadinov, as mohzi wrote, is dedicated to doing the research that will further everyone's knowledge about the prevalence of CCSVI and its effective treatment. There's so much that isn't known. Help the process by donating to BNAC and to other researchers, and by spreading the information as it is published.