Then he should give reasons why that's possible. As it is, it seems to me like he is simply ignoring the math behind ageing. The following would be a better argument, IMO:

The Gompertz law describes human mortality as it currently is. It says that human mortality over time increases more than exponentially. To defy the Gompertz law, bold steps are necessary. Constant maintenance via external drugs that do what our immune system currently does or re-setting our immune system to a younger age may be necessary, as well as keeping the length of our telomers c