COVID is only BSL-3. China has over 100 of those, so the odds of a city center being near a lab is much higher.
If COVID had an incubation period of a 1-2 weeks, it's also possible for the outbreak to occur in a city center that is not a likely location for human/bat/animal interactions, so the percentage will increase further.
If COVID had an incubation period of a 1-2 weeks, it's also possible for the outbreak to occur in a city center that is not a likely location for human/bat/animal interactions, so the percentage will increase further.