But it does rely on that false premise: value stored=value spent.

Please try it, define money and it's function, and please read everything on that bibocurrency website, you will see the fallacy for what it is:
money is either a reservoir of value/a commodity or it is a metric, a standard. It is very crucial that we understand the distinctions between an unstable system/one that appears stable and a actually stable system: Bounded Input Bounded Output.