Meanwhile in the US, hysterical partisans attacked Trump for correctly naming the virus along with its origin. This resulted in a societal unwillingness to direct blame at the Chinese government for all their numerous missteps, starting with suppression of early reports of a new pneumonia like illness in late 2019. How many deaths could have been avoided with just the most basic level of transparency and responsibility?
He spent months doing nothing in preparation, and denying there was an issue then when it turned out there was an actual problem decided it was all China's fault ... even though they had it largely under control by that point. That's why people were "hysterical" - he saw it coming, did nothing and refused to take any responsibility, but blamed someone else. He wasn't trying to accurately identify the source of the virus, he was trying to save his own skin.
Sure it's frustrating that we only found out in (I think) December that it was spreading human-to-human, and it'd be good to see some actual investigation from China. But Trump's finger-pointing was all just desperate attempt to save face and deflect from his own poor management and nothing more. Your question should be rephrased "How many deaths could have been avoided with just the most basic level of competency?" and directed at Donald Trump and his administration.
I'm not condoning or advocating conspiracy theories, but where they are wrong, they should be penalised.