I think transhumanism is an idea that is inherently tossed about in a cyberpunk setting, but not by the protagonists so much. I wouldn't call it the flip side at all, I would perhaps call it what the rich think about it. I'm assuming that the CP2077 wealthy class would be totally into transhumanism and tell each other how great they are by having all these implants that allow them to outdo each other and become more than human in all kinds of neat ways. Even a hacker with a math co-processor installed in his brain or a mercenary with a cyberlimb is technically becoming more than human through technology, he just might not feel like he has a choice.