After China abandoned its restrictive "zero Covid" policy about two weeks ago, regional numbers of infected persons with coronavirus point to explosive outbreaks and overstretched healthcare systems, writes Chang Che, Asia technology correspondent for The New York Times (NYT). However, the intensity and magnitude of the country's first nationwide outbreak have remained largely a mystery as official figures from the central government remain low. The government has a narrow definition of which deaths should count as caused by Covid. Anecdotal evidence, like social media postings of hospital morgues overcrowded with body bags, is quickly taken down by censors. Now, a…