Enough people in NYC have died that you would see the excess mortalities very clearly even if you smeared them out over a few months.
Also tests have shown that almost no people in the Bay Area were infected prior to mid-Feb and only a low single digit percentage had antibodies in Santa Clara county as of early April.
There is no evidence supporting your theory and plenty of strong evidence contradicting it. "Lots of people have Chinese friends and therefore everyone is already infected" is not a convincing line of argument.
Let me put it this way. If you live in the Bay Area, you know people from Wuhan. We got a huge head start on the rest of America.