"That just means it spread from China earlier than thought. "
nope -- it only 'means' that if you've got a bias against China
what it MEANS so far is that the earliest reports are from Italy - and, it also means that IF the Italians had done some sampling and 'identified' the virus and reported it to WHO
the world would be looking in Italy for the source
this isn't a difficult concept - this is very simple logic