While I am a fan of SMBC, in this case he's not doing existentialism justice (or not understanding existentialism). Existentialism is not the same thing as deathism. Existentialism is about finding meaning and responsibility in an absurd existence. While mortality is certainly absurd, biological immortality will not make existential issues go away. In fact, I suspect it will make them stronger..
edit: on the other hand, "existentialist hokey-pokey" is both funny and right on the mark!
I don't see how this strip can be considered to be about existentialism.
EDIT: Actually, I'm no longer sure what the strip is about. It obviously starts with Camus' absurdism, but then switches from his anti-nihilist argument against suicide in an absurd world to a potential critique of... what? nihilism? absurdism? as a means of resolving the cognitive dissonance of having a finite lifespan while wanting to live forever... Or does it? Zack Weiner can be convoluted at times.
Happy New Year! Here's the latest and greatest installment of rationality quotes. Remember: