First, taiwannews.com is not even remotely reliable for anything related to mainland China. This is the same outlet that claimed the Three Gorges Dam was about to break last year. Taiwannews.com loves disaster stories about China, and isn't afraid to invent them.

Second, all these stories about China supposedly concealing deaths in the Shanghai outbreak came out just a few weeks after cases began to rise. Back then, there were only a handful of reported deaths. A few weeks later, there have been over 500 deaths (roughly in line with what one would expect, given the number of infections), and these claims of concealing deaths look pretty silly. Deaths always lag cases, and there can also be reporting delays.