JL, i would say that one is both nothing and everything even now, not only 'after death'. this is experienceable and knowable right now.
frank's position seems to be everything is a blind guess except 'what is is'. unfortunately, he doesn't realise that that is also a blind guess. it stems from an inability or unwillingness to experience 'what is' to its maximum degree. if one becomes aware of the eternal and infinite nature of awareness, then the question of what happens after death becomes known, not as a prediction about the future, but as an experience now. we can know ourselves to be nothing and everything right now, and therefore the question of death is meaningless. all it requires is to give up the restricting identity with consciousness, which causes belief in concepts such as reality, ultimate truth etc etc. even non duality is a concept, but it is the only concept capable of leading one to pure awareness, which knows itself to be eternal and infinite.