It&#x27;s still handwaving from a twenty-thousand foot view, whereas the devil is in the details.<p>I don&#x27;t see how his thesis addresses the very large difference in lifespans for different species, first and foremost.<p>Secondarily, although he addresses the body&#x27;s repair mechanisms, I don&#x27;t see how he puts a new limit on their capacity, unless I overlooked it, or unless he thought things like the Hayflick limit etc. perfectly address that (which it does not completely do).