Whether or not the case load was underestimated it had a high lethality easily transmitted and no effective treatment and no vaccine. That much was widely and readily known and the time lost resulting from slow preparation proved deadly.It did originate in China.
Our slow response is a direct result of china lying to the world about their outbreak. Trump has been following the suggestions of scientists from the start. Their suggestions are fluid because the data changes. We now know all the data China put out was falsified.
China lied, people died.