It dramatically lowered contacts which inevtiably lowers infection. It worked just like every other lockdown around the world worked.
So we have a very comparable location without a lockdown with a better result, but because you "know" lockdowns work, we now have proof that the lockdown worked.
Just as an example about how terribly the lockdown is working, we had an afruf in our shul in Lakewood, for a family that lives in the red zone in brooklyn. I have no problem with it and am happy our shul was able to help them avoid the lockdown, but if you think it was effective, I have news for you.