all the fed has to do in order to tighten money supply is increase reserve requirementd
instead, they removed reserve requirements altogether
and raised rates
basically printing tons of new money and handing it to bond holders
Discussion
They could accelerate the contraction of M2 by selling the bonds on their balance sheet on the open market, but that would break the bond market. Instead they're just letting these treasuries mature and roll off.
The Fed got rid of reserve requirements a couple of years ago, but they are still paying interest on reserves.