China and America has had a tariff tug-of-war since July of 2018. The first signs of a truce occurred on January 15, 2020. On February 21, 2020 “China’s Tariff Commission unveiled two new lists to exempt some of the US imports from additional Chinese tariffs. The two lists will both be effective for one year from February 28, 2020 to February 27, 2021 which included medical equipment like non-invasive ventilators and temperature sensors.”
Therefore, it is not logical to expect China early in its pandemic to willingly share information out of a sense of a global duty with the American administration about COVID-19.
China’s behavior is no different than the Trump stay-at-home protesters that refuse to do their duty to protect their neighbors and community, as asked by their Governors, from the disease.