What does "the hard problem of consciousness" have to do with biological immortality? We're not talking about downloading our consciousnesses into computers here, we're talking about eliminating aging and achieving biological immortality (which is a real thing: some other species do have this). You don't have to know anything at all about consciousness to do this, you just have to figure out how cells and bodies age, and how to stop it.

Downloading our memories and consciousnesses a la "Altered Carbon", if this is even possible, is an entirely different and orthogonal problem.