Hey, thanks for the question and the praise; I can't wait to get more out!
As Beloch mentions below, the Augmentions blog post actually deals with biomodding and cyberware in-setting, but the gist of it is that a biolock allows a person to lock their physical processes for a time at that physical age. It prolongs their lifespan, but biolocks can only last so long before they need to be replaced, and the body can only handle so many.
So people are still mortal, but they can live much, much longer lives as a result of the technology!