What do you mean about the redefine money again with bitcoin? What do you need to have in order to have bitcoin? Money. Right? Why do we need to redefine?
Yes. In order to have Bitcoin, you need money. Such a statement stands true for all forms of money. To gather fiat, you needed gold or assets to collateral for loans.
We have seen money evolve over years from cowrie shells to fiat. I mentioned redefining in that context, whether Bitcoin unlocked an unexplored dimension of money.