I think the dragon-tyrant here should be interpreted as a metaphor specifically for death through aging, and not death generally. Because death is not any single condition (representable through a token), but the vast set of states that vastly outnumber the set of "living states".

Solving the problem of aging wouldn't solve the problem death, curing all sickness wouldn't solve the problem of death, preventing all accidents wouldn't solve the problem of death.

Indeed, if we get philosophical (and transhumanist), we need to find a reasonable definition of death (and life), possibly detached from the necessity of continuous physical existence.

[edited for readabiliy]