Not a headwind in the same way as you described the tailwind provided to the market (not a consistent definition). The headwind you describe here is psychological (and as I said earlier, my article agrees with this). However, the upping of the discount rate has no impact on reserves. Neither will upping the target rate for federal funds. But, the tailwind you described did impact reserves because the tailwind was the injection of reserves into the banking system. Consistently, I am defining headwind to be the converse of this ... the draining of reserves from the system. This is not happening and is not likely to happen for some time.
As far as signals are concerned, the Fed sends signals all the time. Everyone knows that the Fed would like to reduce its balance sheet. This is not news. But what is in serious question is when the Fed will actually commence its exit ... when it will begin draining reserves by selling assets. This is what matters. There is no new information here.
Brian