Can a full-throated commitment to "Austerity Economics" decrease the fiscal multiplier of the deficit?

Yes, a full throated commitment to Austrerity Economics decreases the fiscal multiplier of the deficit such that the fiscal multiplier is zero because the central bank control economic growth. The government increases its expenditure or reduce taxes in such a way that the rate of interest increases and it creates the problem of deficit in an economy and at the same time, the central bank increases money supply by generating new money in such a manner that the LM curve shifts rightward which decreases the rate of interest in such a manner that the output remains the same. It results the zero economic growth in an economy. And, it solve the problem of deficit in an economy.