I don’t understand what you mean by this. The “money multiplier” is simply a “ratio of commercial bank money to central bank money under a fractional-reserve banking system.” Austrians do not deny that a fractional reserve banking system leads to an increase in the supply of money…in fact that’s essentially the main problem they have with it.
In Keynesian economics “the multiplier” is typically what Keynes referred to as an “investment multiplier”. This is a completely different concept than the “money multiplier”. Did you happen to look into any of the resources that were suggested to you in the other thread?
I have no idea what “a dollar spent in the economy is used continuously” means, or what relevance it has to the issue at hand. Could you explain?