source for highlighted study: https://journals.sagepub.com/doi/full/10.1177/0300891620974755?journalCode=tmja
China also claims to have found a perfect match of the Wuhan strain in Italy predating the first case in Wuhan. I couldn't dig up the exact study so i didn't screenshot it here, but here's a link anyway for completeness.
https://www.scmp.com/news/china/science/article/3113444/coronavirus-italian-scientists-find-perfect-match-wuhan-strain
Even without that though, it's looking pretty likely that COVID-19 actually originated in italy.
edit: found the new study!
https://pubmed.ncbi.nlm.nih.gov/33292923/
We describe the earliest evidence of SARS-CoV-2 RNA in a patient in Italy, ≈3 months before Italy’s first reported COVID-19 case. These findings, in agreement with other evidence of early COVID-19 spread in Europe, advance the beginning of the outbreak to late autumn 2019
Ah yes, the "whoever smelted it delted it," approach to contagious disease. China didn't sit on their hands dealing with it, therefore it's their fault. Wasn't it also in the US before the first official case?