Another alternative to banning is to move their mining rigs to more crypto friendly country...
Moving to a new country isn't as easy as it sounds. These people have a life in China, family, children, friends. All that can't be abandoned over night just like that. Not to mention familiarizing yourself with the regulations of the new country, finding an appropriate and cheap location to set up your farm, and physically moving your equipment from point A to point B. All that takes time and money. There is also the language barrier, cultural differences to consider, etc. Of course it's doable when someone forces you into it, but I believe that's not what the Chinese miners want to do.
I guess there will be still operating illegal mining in china, like those you have mentioned. It's very hard to move to another country. First of all, It needs significant money to move out, including your family/place/foods.
As China is known for illegal stuff, I'm sure they will still be some peoples/group/organisation that will operate mining rigs stealthy in China.