He's dedicated to the cause of eliminating death and aging. That's good enough for me.
In order to eliminate aging and death, you must have an educated and ambitious populace who can mobilize resources to wage war on mortality.
Yes, he's a techno-libertarian, but like all great techno-libertarians he's interested in killing what kill human beings and crystallizing human potential. Aubrey de Grey even mention libertarians as one of the group that is most supportive of his work.
Why libertarianism and anti-aging/anti-death and technology in general goes together? I have no idea.
This is a pointless exercise that is doomed to failure. Sure, we may be able to extend a person's life to 200 or 300 years. But will we be able to cure all future diseases (for the next million years), eliminate accidents, natural disasters, and sudden body failure? What about when the sun burns out in a few billion years? Will we be able to successfully colonize another planet while keeping the same safety precautions for human life?
Death is as much a part of life as birth. It will not be eliminated unless you eliminate life. To think otherwise is a denial of reality.