That is one of the bravest documentation I have ever seen.The three director have risked their own life to make this documentation. They travelled to the epicenter during the lockdown, wearing full set of protective equipment and stayed one and half month.
I have no idea why people always assume the political views when they are facing Chinese directors or watching something about China. But please remember, they do not have any approval from Chinese government. It means that they were facing legal risk too. I believe the only request of a documentation is to reflect the truth, not to introduce political viewpoints.