that's not communism, that's mere socialism. Communism is pretty much defined by "To each according to his need".
I'm not sure I understand your objection. I wasn't imagining anything other than an attempt at "To each according to his need". That might still leave many people poorer than under capitalism. (I said "all" but that was silly, and maybe that's the cause of any misunderstanding; I should have said something like "we will collectively be slightly poorer", which is what I actually meant.)
That might still leave many people poorer than under capitalism.
Nope. The promise of communism is the satisfaction of all your needs, not just satisfaction of what we can afford to, given the limited amount of stuff/services which we have available. It is supposed to be a place of plenty, not just a place where thin gruel is shared fairly.
How much money would it take to engineer biological immortality for at least half of the world's population, within 20 years, with 99% confidence?