Yes, bloating the Fed's balance sheet by over $400B in four months has a massive impact on stock markets. And billions of repo liquidity unleashed each day can be seen impacting the daily action as well (see: Repo Lightning).
So what's Jerome Powell have to say about all this? Silence. Not a word.
Of course he doesn't have to because the crack reporters never confront him on the issue in his post Fed meeting press conferences. Bubble away accountability free. Why bother asking the hard questions? That may just get you disinvited from the next press conference. Too strong of an assessment? I let you be the judge, but why are the hard questions not asked when it matters?
But actually we don't need to wait for the answer from a press conference. Why? Because we already know the answer and the answer is: He knows.