With regard to the Treasury printing money, providing it to the Fed for management, and the Fed buying T bills and thus giving the money back to the government it’s a Ponzi scheme. I believe I stated that earlier too.
But for 12 years it hasn’t resulted in inflation. The only reason I can see that happening is due to the increase in national debt which balances the transaction out. Without that accounting measure there would be a net increase in currency (I think...) as the Fed would literally have created currency and just given it to the government . This is all just a guess on my part but that’s the only thing that makes sense to me