I don't understand why it's not a crime to alter or suppress medical information on political grounds in any circumstances other than possibly a absolute necessity for protecting the [vast] majority by some way eg possibly avoiding panic reactions.
Because in the PRC, the government, legislature and military are all officially subordinate to a political organization. The WHO is a treaty organization, effectively above the laws of nations because it is an offshoot of a diplomatic forum.
Whatever you think of the reasons, these are the reasons.