The logic of Totalitarian Communist governments cant be understood by us...For almost 20 years, the North Koreans would photoshop the Ryungong hotel out of pictures of Pyongyang, despite the fact everybody knew it was there, it was a giant 100 story abandoned/unstable pyramid and had no windows in the middle of town.
When people started getting pictures out, their solution was not to finish the building or demolish it, they just put windows on it to make it look finished...again, despite everyone knowing its a rotted and vacant husk.
China will either ignore Hong Kong in official communication or act as if its a happy place that loves the mainland and is fully integrated.