The difference is that your example fled while most likely being guilty and mostly just wanted to evade prosecution, in China there is no need for any actual crime
No justice system that's actually fair can have a 99.8% conviction rate at trial. It's a process designed to achieve convictions and punishment, not actually discover the truth.
> Reconsider travel to Mainland China due to the arbitrary enforcement of local laws, including in relation to exit bans, and the risk of wrongful detentions.